Here's a quick rundown on each of the candidates Trump is considering for secretary of state

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President-elect Donald Trump and his transition team are at work vetting individuals to serve in the incoming White House cabinet.

And a few names have cropped up repeatedly for the secretary of state job — former New York City Mayor Rudy Giuliani, Tennessee Sen. Bob Corker, former US ambassador to the United Nations John Bolton, former House Speaker Newt Gingrich, and South Carolina Gov. Nikki Haley.

Here's a rundown on each candidate.

34 PHOTOS
Rudy Giuliani through the years
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Rudy Giuliani through the years
Rudy Giuliani, former mayor of New York, smiles while arriving to participate in a discussion during the Values Voter Summit with Donald Trump, 2016 Republican presidential nominee, not pictured, in Washington, D.C., U.S., on Friday, Sept. 9, 2016. Trump and his running mate said this week that Russian President Vladimir Putin is a stronger leader than U.S. President Barack Obama, provoking Democratic condemnation and prompting some Republicans to distance themselves. Photographer: Andrew Harrer/Bloomberg via Getty Images
NEW YORK, NY - FEBRUARY 27: Rudolph Giuliani, US Attorney for the Southern District of New York, is photographed February 27, 1985 announcing the arrests in the 'Commission' case. A Federal racketeering indictment charged nine men with participating in a ''commission'' that governs the five organized-crime ''families'' in New York City. (Photo by Yvonne Hemsey/Getty Images)
D.A. Rudolph Giuliani at Daily News Newsmakers Conference. (Photo By: Anthony Casale/NY Daily News via Getty Images)
Koch & Giuliani, join comm. of Doi Kevin Frawley, outline the guilty pleas of six arrested in bribes. 1. Giuliani and Koch await their turn in press con at D.O.I. 80 Maiden Lane. 2. Giuliani and Koch. 3. Head to Head after Giuliani gave Koch an Excellent to a reporter's questionKoch got up to shake his hand when he was through. January 17, 1989. (Photo by Louis Liotta/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images)
Giuliani holds press conference about the NYC homeless. August 01, 1989. (Photo by Dan Brinzac/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images)
Guiliani at Inside Edition -- New TV personality at Inside Edition, Rudy Guiliani. Rudy Guiliani. Rudy honing up before taping of his part of the show. Rudy reviewing tapes in editing room. March 12, 1990. (Photo by Michael Schwartz/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images)
Rudy Giuliani. November 05, 1993. (Photo by David Rentas/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images)
UNITED STATES - JANUARY 02: Andrew Giuliani yawns as his father Rudy speaks after he was sworn in as mayor of New York City. (Photo by Budd Williams/NY Daily News Archive via Getty Images)
Rudy Giuliani. January 12, 1994. (Photo by David Rentas/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images)
Police, criminal justice unions endorse Cuomo for governor on steps of City Hall. Thomas Scotto, Pres. of N.Y.C.P. detectives, endorsement assoc. was between them. October 25, 1994. (Photo by Michael Norcia/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images)
(Original Caption) California governor Pete Wilson meets with New York City mayor Rudy Giuliani at city hall. (Photo by mark peterson/Corbis via Getty Images)
UNITED STATES - SEPTEMBER 26: New York Knicks' President David Checketts (left) and NBA Commissioner David Stern present Mayor Rudy Giuliani with a Giuliani 98 jersey. The 1998 NBA All-Star game will be held in New York City. (Photo by Keith Torrie/NY Daily News Archive via Getty Images)
UNITED STATES - JULY 02: Shadow of Mayor Rudy Giuliani shows against background after he was endorsed by the hotel workers union at the Waldorf-Astoria., (Photo by Susan Watts/NY Daily News Archive via Getty Images)
26 Oct 1996: New York City mayor Rudy Guilliani, George Steinbrenner, and New York Yankees manager Joe Torre celebrate after Game Six of the World Series against the Atlanta Braves at Yankee Stadium in New York City, New York. The Yankees won the game, 3-
UNITED STATES - MAY 04: Mayor Rudy Giuliani is flanked by CBS President Leslie Moonves (left) and Donald Trump at news conference at the GM Building, where CBS announced that Bryant Gumbel will be the host of its new morning news program, 'This Morning.' Show, to be launched Nov. 1, will broadcast from Trump's International Plaza Building., (Photo by Andrew Savulich/NY Daily News Archive via Getty Images)
399759 01: Former New York Mayor Rudy Giuliani made his first appearance on 'The Tonight Show with Jay Leno' January 16, 2002 in Burbank CA. Giulani talked about the events of September 11 and his recent selection as Time Magazine's 'Man of the Year.' (Photo by Paul Drinkwater/NBC via Getty Images)
SATURDAY NIGHT LIVE -- Episode 9 -- Air Date 12/15/2001 -- Pictured: (l-r) Tina Fey, Rudy Giuliani, Jimmy Fallon during 'Weekend Update' on December 15, 2001 (Photo by Dana Edelson/NBC/NBCU Photo Bank via Getty Images)
400517 05: Former New York City Mayor, Rudy Giuliani, gives a thumbs up to football fans before Super Bowl XXXVI February 3, 2002 in New Orleans, LA. Super Bowl XXXVI will be played by the New England Patriots and the St. Louis Rams at the Superdome in New Orleans, LA. (Photo by Jed Jacobsohn/Getty Images)
MANCHESTER, UNITED KINGDOM - JANUARY 22: Former New York Mayor Rudolph Giuliani smiles as he sits with copies of his book 'Leadership', published last October on January 22, 2003 in Waterstones bookshop, Deansgate, Manchester, England. The book outlines 'the principles Giuliani has worked through, and how he has adhered to them through his career, and how they came into play in the aftermath of the World Trade Centre'. (Photo by Gary M.Prior/Getty Images)
CEDAR RAPIDS, IA - JANUARY 19: Former New York City Mayor Rudy Giuliani gestures as he takes questions from emergency personnel at a rally held to drum up support for the 2004 Bush-Cheney presidential ticket January 19, 2004 in Cedar Rapids, Iowa. Iowa will be the first state in the nation to test the popularity of the Democratic presidential hopefuls when it holds the caucuses tonight. (Photo by Scott Olson/Getty Images)
UNITED STATES - DECEMBER 24: Former Mayor Rudy Giuliani kisses the hand of a little girl as he visits Hale House in Harlem on the day before Christmas to pass out gifts and read holiday stories to the children. (Photo by Susan Watts/NY Daily News Archive via Getty Images)
NEW YORK - SEPTEMBER 11: Former New York City Mayor Rudolph Giuliani speaks as he makes a tribute to the victims of the terrorist attacks of 2001 on September 11, 2005 in New York City. This is the fourth anniversary of the September 11th attacks. (Photo by Daniel Berehulak/Getty Images)
WILKES-BARRE, PA - NOVEMBER 3: Former New York City Mayor Rudy Giuliani (R) speaks as U.S. Sen. Rick Santorum (R-PA) (L) looks on at a campaign rally November 3, 2006 in Wilkes-Barre, Pennsylvania. Santorum faces Democratic challenger Bob Casey Jr. in the November election. (Photo by Jeff Fusco/Getty Images)
SPARTANBURG, SC - FEBRUARY 21: Republican presidential hopeful, former New York Mayor Rudy Giuliani holds a campaign rally with first responders at the North Spartanburg Fire Department on February 21, 2007 in Spartanburg, South Carolina. (Photo by Charles Ommanney/Getty Images)
HENDERSON, NV - NOVEMBER 01: Former New York City Mayor Rudy Giuliani reacts as he is greeted by supporters at a McCain-Palin regional headquarters office November 1, 2008 in Henderson, Nevada. As candidates continue to bring out the political heavy-hitters for their last pitches, Giuliani will be campaigning in several states for Republican presidential nominee Sen. John McCain (R-AZ) leading up to the election on November 4. (Photo by Ethan Miller/Getty Images)
NEW YORK - NOVEMBER 06: Former New York City Mayor Rudy Giuliani celebrates during the New York Yankees World Series Victory Parade on November 6, 2009 in New York, New York. (Photo by Jared Wickerham/Getty Images)
LATE NIGHT WITH JIMMY FALLON -- Episode 487 -- Pictured: (l-r) Former New York City Mayor Rudy Giuliani during an interview with Jimmy Fallon on August 8, 2011 (Photo by Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
UNITED STATES â SEPTEMBER 6: Former New York mayor Rudy Giuliani waits to speak at the National Press Club luncheon in Washington on Tuesday, Sept. 6, 2011. (Photo By Bill Clark/Roll Call)
July 27, 2012 Former NYC Mayor Rudy Giuliani and the Republican Team Meet & Greet to Support Romney in his Presidential Campaign. Mayor Giuliani looking for support as the guest speaker in the Cuban Community of Calle Ocho - Little Havana in South FloridaFlorida (Photo by Michele Eve Sandberg/Corbis via Getty Images)
SCARBOROUGH, NY - JULY 17: Rudy Giuliani attends Joe Torre Safe At Home Foundation 2013 Golf and Tennis Classic at Sleepy Hollow Country Club on July 17, 2013 in Scarborough, New York. (Photo by Bobby Bank/Getty Images)
Florida Gov. Rick Scott and former Mayor of New York Rudy Giuliani, arrive at a campaign stop in Miami, as Scott kicks off the Get Out the Early Vote bus tour (Photo by Michele Eve Sandberg/Corbis via Getty Images)
NEW YORK, NY - APRIL 15: Former Mayor of New York City Rudy Giuliani attends the Opening Night premiere of 'Live From New York!' during the 2015 Tribeca Film Festival at the Beacon Theatre on April 15, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images for the 2015 Tribeca Film Festival)
PHOENIX, AZ - AUGUST 31: Rudy Giuliani, former mayor of New York City, speaks in support of Republican presidential candidate Donald Trump during a Trump campaign rally on August 31, 2016 in Phoenix, Arizona. (Photo by Ralph Freso/Getty Images)
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Rudy Giuliani

As of now, Giuliani is Trump's "top pick" for secretary of state, according to The Wall Street Journal. Giuliani was mayor of New York City during the 9/11 terrorist attacks. He has been a controversial figure on the campaign trail — he gave a fiery speech at the Republican National Convention in July and has been one of Trump's top surrogates ever since.

Giuliani was a high-profile prosecutor before he served as mayor, which established his reputation as a firebrand. While he was mayor, he was known to practice a localized version of foreign policy, The New York Times noted this week. He once kicked Palestinian leader Yasir Arafat out of a symphony performance at the Lincoln Center in New York, refused to dine with Cuban leader Fidel Castro, and threatened to boot the UN from its headquarters in the city.

The Times describes him as a neoconservative who supports Israel, is suspicious of Iran, and believes in aggressive foreign policy.

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Bob Corker

Corker confirmed to CNBC this week that he is being considered for the secretary of state job and has had conversations with the Trump transition team. Corker also, however, told The Tennessean that he doesn't expect to get the job.

Corker has been a senator since 2007 and is the current chairman of the Foreign Relations Committee. He seems to differ with Trump somewhat on his views of Russia and its president, Vladimir Putin. Corker told CBS News this week that, while its good for two world leaders to begin their relationship on a "positive note," Putin has also "shown himself to be a brutal dictator-like leader" who has "worked against our national interests."

18 PHOTOS
John Bolton
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John Bolton
Former U.N. Ambassador John Bolton speaks during the Freedom Summit the Freedom Summit, Saturday, May 9, 2015, in Greenville, S.C. (AP Photo/Rainier Ehrhardt)
Ambassador John Bolton, Senior Fellow, American Enterprise Institute, speaks during Faith and Freedom Coalition's Road to Majority event in Washington, Thursday, June 19, 2014. (AP Photo/Molly Riley)
Former US Ambassador to the United Nations John Bolton speaks during the American Conservative Union Conference March 6, 2014 in National Harbor, Maryland. The annual conference is a meeting of politically conservatives Americans. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
NASHUA, NH - APRIL 17: Former Ambassador to the United Nations John Bolton speaks at the First in the Nation Republican Leadership Summit April 17, 2015 in Nashua, New Hampshire. The Summit brought together local and national Republicans and was attended by all the Republicans candidates as well as those eyeing a run for the nomination. (Photo by Darren McCollester/Getty Images)
LAS VEGAS, NV - MARCH 29: Former United States ambassador to the United Nations John Bolton speaks during the Republican Jewish Coalition spring leadership meeting at The Venetian Las Vegas on March 29, 2014 in Las Vegas, Nevada. The Republican Jewish Coalition began its annual meeting with potential Republican presidential candidates in attendance, along with Republican super donor Sheldon Adelson. (Photo by Ethan Miller/Getty Images)
DES MOINES, IA - JANUARY 24: Former Ambassador to the United Nations John Bolton speaks to guests at the Iowa Freedom Summit on January 24, 2015 in Des Moines, Iowa. The summit is hosting a group of potential 2016 Republican presidential candidates to discuss core conservative principles ahead of the January 2016 Iowa Caucuses. (Photo by Scott Olson/Getty Images)
WASHINGTON - DECEMBER 4: US President George W. Bush (R) and Ambassador to the UN John Bolton (L) meet in the Oval Office of the White House December 4, 2006 in Washington, DC. Bush accepted Bolton's resignation as Ambassador to the United Nations when his term is up in January 2007. (Photo by Brendan Smialowski/Getty Images)
HOUSTON, TX - MAY 03: Former U.S. ambassador to the United Nations John Bolton speaks during the 2013 NRA Annual Meeting and Exhibits at the George R. Brown Convention Center on May 3, 2013 in Houston, Texas. More than 70,000 peope are expected to attend the NRA's 3-day annual meeting that features nearly 550 exhibitors, gun trade show and a political rally. The Show runs from May 3-5. (Photo by Justin Sullivan/Getty Images)
Former Ambassador John Bolton speaks during the Conservative Principles Conference hosted by U.S. Rep. Steve King, R-Iowa, Saturday, March 26, 2011, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Former U.S. Ambassador to the United Nations John Bolton speaks at the opening night dinner of the California Republican Convention in Sacramento, Calif., Friday, March, 18, 2011.(AP Photo/Steve Yeater)
John Bolton, former US ambassador to the United Nations (R) and Aaron Abramovitch, Director-General of Israeli Ministry of Foreign Affairs attend a panel during the eighth annual Herzliya Conference in Herzliya, 22 January 2008. The eight annual Herzliya Conference, entitled Balance of Israel's National Security, and coordinated by the Institute for Policy and Strategy at the Interdisciplinary Center Herzliya's Lauder School of Government, started yesterday and lasts for 3 days. The theme for this year's conference is 'Israel at 60: Tests of Endurance.' AFP PHOTO/JACK GUEZ (Photo credit should read JACK GUEZ/AFP/Getty Images)
NEW YORK - OCTOBER 14: U.S. Ambassador to the United Nations John Bolton addresses the Security Council after it unanimously voted in favor of the resolution for sanctions against North Korea at the United Nations headquarters October 14, 2006 in New York City. The council voted unanimously to approve the resolution which demands that North Korea destroy all of its nuclear weapons and bans the import and export of materials used for the creation of weapons of mass destruction. (Photo by Stephen Chernin/Getty Images)
Outgoing U.N. Ambassador John Bolton smiles during a photo-op with President Bush, not shown, in the Oval Office of the White House in Washington, Monday, Dec. 4, 2006. (AP Photo/Gerald Herbert)
John Bolton, U.S. Ambassador to the United Nations, speaks during the United Jewish Communities International Lion of Judah Conference, Sunday, Sept. 10, 2006, in Washington. (AP Photo/Haraz N. Ghanbari)
(FILES) A file picture dated 10 October 2006 shows former US ambassador to the United Nations John Bolton speaking to the media after a meeting of the five permanent members of the Security Council (Britain, China, France, Russia and United States) plus Japan, where they discussed a resolution on the North Korea nuclear situation at the UN headquarters in New York. Bolton said 21 January 2008 that Israel may have to take military action to prevent its archfoe Iran from acquiring an atomic bomb. Bolton also said that further UN sanctions against the Islamic republic will be ineffective in stopping Iran's controversial nuclear programme which Israel and the US believe is aimed at developing a bomb -- a claim denied by Tehran. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
UNITED NATIONS, UNITED NATIONS: John Bolton (C), United States Ambassador to the United Nations, speaks to the media 13 October 2006 before a Security Council meeting about Georgia, to be followed by discussions on the North Korea resolution at UN headquarters in New York. The UN Security Council on Friday was set to consider a compromise draft resolution mandating wide-ranging sanctions against North Korea over its declared nuclear test but specifically ruling out the use of force. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
NEW YORK - NOVEMBER 13: John Bolton, U.S. ambassador to the United Nations, speaks to the media after a meeting with the five permanent members of the Security Council and Germany concerning Iran at the French Mission to the UN November 13, 2006 in New York City. Bolton received a controversial recess appointment to the post by President Bush in August 2005 and was renominated last week, but would face confirmation from a new Democrat-controlled Senate if not voted on by the current Congress' recess in January. Democrats oppose the nomination. (Photo by Michael Nagle/Getty Images)
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John Bolton

Bolton, a former US ambassador to the UN under President George W. Bush, is another rumored pick for secretary of state.

He's a well-known neoconservative hawk who is currently a senior fellow at the American Enterprise Institute. In addition to serving as UN ambassador, Bolton worked in the State Department under Bush and was one of the architects of the Iraq War.

Like Trump, he opposes the Iran nuclear deal, but unlike the president-elect, he's rather interventionist in his foreign policy.

19 PHOTOS
Newt Gingrich through the years
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Newt Gingrich through the years
UNITED STATES FILE PHOTO: Rep. Newt Gingrich, R-Ga., gives a lecture on Sept. 18, 1993 during the first day of his 'Renewing American Civilization' course taught in fall 1993 at Kennesaw State College in Kennesaw, Ga. The course later became part of Congressional ethics violation charges leveled against Gingrich in 1996. (Photo by Bill Clark/Getty Images)
WASHINGTON, DC - JANUARY 5: Newt Gingrich(L), speaker of the US House of Representatives, laughs as US President Bill Clinton(R) looks on during a meeting of the bi-partisan leadership of Congress 05 January at the White House. The day after the opening session of the 104th Congress, Republicans and Democrats met with Clinton to discuss the legislative agenda. (COLOR KEY: Red in ties.) (Photo credit should read J. DAVID AKE/AFP/Getty Images)
CLAREMONT, NH - JUNE 11: President William Jefferson Clinton and Speaker of the House Newt Gingrich, share a laugh at a meeting held at a senior citizens center in Claremont, N.H. (Photo by John Bohn/The Boston Globe via Getty Images)
ME.Gingrich.Newt.RDL (kodak) House speaker Newt Gingrich greets supporters at a fundÂraiser at the Anaheim Hilton and Towers in Anaheim. TIMES (Photo by Robert Lachman/Los Angeles Times via Getty Images)
UNITED STATES - NOVEMBER 15: Former Speaker of the House Newt Gingrich, R-Ga., speaks during the ceremony to unveil his portrait in Statuary Hall. (Photo By Douglas Graham/Roll Call/Getty Images)
WASHINGTON - DECEMBER 17: (AFP OUT) Former U.S. Speaker of the House Rep. Newt Gingrich (R-GA) (L) speaks as he is interviewed by moderator Tim Russert (R) during a taping of 'Meet the Press' at the NBC studios December 17, 2006 in Washington, DC. Gingrich spoke on various topics including the war in Iraq and the 2008 Presidential election. (Photo by Alex Wong/Getty Images for Meet the Press)
WASHINGTON - DECEMBER 06: Newt Gingrich and Callista Gingrich attend the 32nd Kennedy Center Honors at Kennedy Center Hall of States on December 6, 2009 in Washington, DC. (Photo by Kevin Mazur/WireImage)
MANCHESTER, NH - JANUARY 07: Republican presidential candidates (L-R) former Utah Gov. Jon Huntsman Jr., U.S. Rep. Ron Paul (R-TX), former Massachusetts Gov. Mitt Romney, former U.S. Sen. Rick Santorum, former Speaker of the House Newt Gingrich and Texas Gov. Rick Perry participate in the ABC News, Yahoo! News, and WMUR Republican Presidential Debate at Saint Anselm College January 7, 2012 in Manchester, New Hampshire. The GOP contenders are in the final stretch of campaigning for the New Hampshire primary, the first in the nation, to be held on January 10. (Photo by Win McNamee/Getty Images)
WOLFEBORO, NH - JANUARY 07: Republican presidential candidate, former Speaker of the House of Representatives Newt Gingrich speaks during a campaign town hall meeting at the Wright Museum January 7, 2012 in Wolfeboro, New Hampshire. According to a CNN/Time/ORC poll released Friday, Gingrich has dropped from 43-percent in December to 17-percent, putting him even with fellow candidate, former U.S. Senator Rick Santorum. However, both are trailing former Massachusetts Governor Mitt Romney who is polling at 37-percent. (Photo by Chip Somodevilla/Getty Images)
Republican presidential hopefuls, former Massachusetts Govenor Mitt Romney (L), former Speaker of the House Newt Gingrich, take the stage for the NBC News, Tampa Bay Times, National Journal Republican Presidential Candidates Debate at the University of South Florida, January 23, 2012, Tampa, Florida. AFP Photo/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
Republican presidential hopeful, former Speaker Newt Gingrich, delivers remarks during a Hispanic Town Hall January 28, 2012 at the Centro de la Familia church in Orlando, Florida AFP Photo/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/GettyImages)
MESA, AZ - FEBRUARY 22: Republican presidential candidates former Massachusetts Gov. Mitt Romney (L) and former Speaker of the House Newt Gingrich laugh as they participate in a debate sponsored by CNN and the Republican Party of Arizona at the Mesa Arts Center February 22, 2012 in Mesa, Arizona. The debate is the last one scheduled before voters head to the polls in Michigan and Arizona's primaries on February 28 and Super Tuesday on March 6. (Photo by Justin Sullivan/Getty Images)
TAMPA, FL - AUGUST 30: Former Speaker of the House Newt Gingrich and Callista Gingrich speak during a tribute to former president Ronald Reagan at the final day of the Republican National Convention at the Tampa Bay Times Forum on August 30, 2012 in Tampa, Florida. Former Massachusetts Gov. Mitt Romney was nominated as the Republican presidential candidate during the RNC which will conclude today. (Photo by Mark Wilson/Getty Images)
THE TONIGHT SHOW WITH JAY LENO -- (EXCLUSIVE COVERAGE) -- Episode 4289 -- Pictured: (l-r) Newt Gingrich, Nicole 'Snookie' Polizzi, Callista Gingrich backstage on July 18, 2012 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
NATIONAL HARBOR, MD - FEBRUARY 27: Former U.S. Speaker of the House Newt Gingrich (R-GA) addresses the 42nd annual Conservative Political Action Conference (CPAC) February 27, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - APRIL 25: Former United States Secretary of State Madeleine Albright(L) and Newt Gingrich attend The Washington Post White House Correspondents' Pre-Dinner Reception at The Washington Hilton on April 25, 2015 in Washington, DC. (Photo by Brad Barket/Getty Images)
CINCINNATI, OH- JULY 6: Former Speaker of the House Newt Gingrich (R) introduces Republican Presidential candidate Donald Trump during a rally at the Sharonville Convention Center July 6, 2016, in Cincinnati, Ohio. Trump is campaigning in Ohio ahead of the Republican National Convention in Cleveland next week. (Photo by John Sommers II/Getty Images)
CINCINNATI, OH- JULY 6: Former Speaker of the House Newt Gingrich (R) introduces Republican Presidential candidate Donald Trump during a rally at the Sharonville Convention Center July 6, 2016, in Cincinnati, Ohio. Trump is campaigning in Ohio ahead of the Republican National Convention in Cleveland next week. (Photo by John Sommers II/Getty Images)
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Newt Gingrich

The former House speaker and Georgia congressman was another one of Trump's top surrogates during the campaign. Before the election, Trump said that Gingrich would have a role in his administration if he won, and Gingrich has remarked recently that he would like to be involved in Trump's government.

Gingrich was House speaker in the 1990s, but has since then developed a reputation for his rhetoric that, in many ways, mirrors Trump's. He ran for president in 2012, but failed to win the Republican nomination. He also racked up ethics complaints during his time serving in the House.

21 PHOTOS
Nikki Haley, Governor of South Carolina
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Nikki Haley, Governor of South Carolina
CHARLESTON, SC - JUNE 19: Escorted by staff and security, South Carolina Governor Nikki Haley (C) moves from one television interview to another across from the historic Emanuel African Methodist Episcopal Church June 19, 2015 in Charleston, South Carolina. Haley called for the death penalty for Dylann Storm Roof, 21, of Lexington, South Carolina, if he is found guilty of murdering nine people during a prayer meeting at the church Wednesday night. Among the dead is the Rev. Clementa Pinckney, the pastor of the church which, according to the National Park Service, is the oldest black congregation in America south of Baltimore. (Photo by Chip Somodevilla/Getty Images)
Gov. Nikki Haley addresses a full church during a prayer vigil held at Morris Brown AME Church for the victims of Wednesday's shooting at Emanuel AME Church on Thursday, June 18, 2015 in Charleston, S.C. Dylann Storm Roof, 21, was arrested Thursday in the slayings of several people, including the pastor, at a prayer meeting inside the historic black church. (Grace Beahm/The Post And Courier via AP, Pool)
CHARLESTON, SC - JUNE 21: South Carolina Gov. Nikki Haley, right, greets U.S. Sen. Tim Scott, R-SC, at the first church service four days after a mass shooting that claimed the lives of nine people at the historic Emanuel African Methodist Church June 21, 2015 in Charleston, South Carolina. Chruch elders decided to hold the regularly scheduled Sunday school and worship service as they continue to grieve the shooting death of nine of its members including its pastor earlier this week. (Photo by Paul Zoeller-Pool/Getty Images)
South Carolina Governor Nikki Haley speaks to press outside the Emanuel AME Church June 19, 2015 in Charleston, South Carolina.US police arrested a white high school dropout Thursday suspected of carrying out a gun massacre at one of America's oldest black churches, the latest deadly assault to fuel simmering racial tensions. Authorities detained 21-year-old Dylann Roof, shown wearing the flags of defunct white supremacist regimes in pictures taken from social media, after nine churchgoers were shot dead during a Bible study class on Wednesday evening. AFP PHOTO/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
CHARLESTON, SC - JUNE 19: Escorted by staff and security, South Carolina Governor Nikki Haley (C) moves from one television interview to another across from the historic Emanuel African Methodist Episcopal Church June 19, 2015 in Charleston, South Carolina. Haley called for the death penalty for Dylann Storm Roof, 21, of Lexington, South Carolina, if he is found guilty of murdering nine people during a prayer meeting at the church Wednesday night. Among the dead is the Rev. Clementa Pinckney, the pastor of the church which, according to the National Park Service, is the oldest black congregation in America south of Baltimore. (Photo by Chip Somodevilla/Getty Images)
South Carolina Gov. Nikki Haley, center right, joins hands with Charleston Mayor Joseph Riley, left, and Sen. Tim Scott, R-S.C., right, at a memorial service at Morris Brown AME Church for thepeople killed Wednesday during a prayer meeting inside the historic black church in Charleston, S.C., Thursday, June 18, 2015. Police arrested 21-year-old suspect Dylann Storm Roof Thursday in Shelby, N.C. without resistance. (AP Photo/David Goldman)
South Carolina Gov. Nikki Haley signs the state's new domestic violence bill into law on Thursday, June 4, 2015, in Columbia, S.C. The new law increases penalties for domestic violence and has a gun ban for batterers. (AP Photo/Jeffrey Collins)
South Carolina Gov. Nikki Haley, right, sits with her husband Michael, center, and daughter Rena during her inauguration ceremony Wednesday, Jan. 14, 2015. (AP Photo/Richard Shiro)
WASHINGTON, DC - FEBRUARY 23: South Carolina Governor Nikki Haley holds a news conference with fellow members of the Republican Governors Association at the U.S. Chamber of Commerce February 23, 2015 in Washington, DC. Republican and Democratic governors met with U.S. President Barack Obama at the White House Monday during the last day of the National Governors Association winter meeting. (Photo by Chip Somodevilla/Getty Images)
COLUMBIA, SC - MARCH 17: Former Florida Governor and potential GOP presidential candidate Jeb Bush walks with South Carolina Governor Nikki Haley during a visit to Sistercare, a non-profit that aids domestic violence victims and their children on March 17, 2015 in Columbia, South Carolina. Bush announced in December that he 'actively explore' a presidential run in 2016. He is currently on a two day tour through South Carolina and will attend several fundraising events. (Photo by Richard Ellis/Getty Images)
TAMPA, FL - AUGUST 28: South Carolina Gov. Nikki Haley waves on stage during the Republican National Convention at the Tampa Bay Times Forum on August 28, 2012 in Tampa, Florida. Today is the first full session of the RNC after the start was delayed due to Tropical Storm Isaac. (Photo by Mark Wilson/Getty Images)
US Republican Governor of South Carolina Nikki Haley speaks at the Conservative Political Action Conference (CPAC) in National Harbor, Maryland, on March 15, 2013. AFP PHOTO/Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
DARLINGTON, SC - MAY 12: South Carolina Gov. Nikki Haley speaks to the media prior to the NASCAR Sprint Cup Series Bojangles' Southern 500 at Darlington Raceway on May 12, 2012 in Darlington, South Carolina. (Photo by Rainier Ehrhardt/Getty Images for NASCAR)
NORTH CHARLESTON, SC - JANUARY 20: Republican presidential candidate, former Massachusetts Gov. Mitt Romney gives a birthday cake to South Carolina Gov. Nikki Haley during a campaign rally at Charleston Area Convention Center on January 20, 2012 in North Charleston, South Carolina. Romney continues to campaign for votes in South Carolina ahead of their primary on January 21. (Photo by Joe Raedle/Getty Images)
COLUMBIA, SC - JUNE 22: Nikki Haley speaks to supporters as she comes onto stage during an election party for Republican South Carolina Governor candidate Nikki Haley at the State Museum on June 22, 2010 in Columbia, South Carolina. Haley defeated Rep. Gresham Barrett in a runoff election. (Photo by Chris Keane/Getty Images)
COLUMBIA, SC - JUNE 22: Republican candidate for South Carolina Governor Nikki Haley (R) smiles along with her husband Michael Haley (L) and daughter Rena (C) as they watch the runoff election results at the Columbia Sheraton on June 22, 2010 in Columbia, South Carolina. Haley defeated Rep. Gresham Barrett in a runoff election. (Photo by Chris Keane/Getty Images)
South Carolina Gov. Nikki Haley address a crowd of supporters during an election night party, Tuesday, Nov. 4, 2014, in Columbia, S.C. Haley beat Democratic state Sen. Vincent Sheheen to win a second term. (AP Photo/Stephen B. Morton)
South Carolina Gov. Nikki R. Haley, left, and New Jersey Gov. Chris Christie, right, arrive for a news conference at the Republican Governors Association's quarterly meeting on Wednesday May 21, 2014 in New York. (AP Photo/Bebeto Matthews)
South Carolina Republican Gov. Nikki Haley announces her candidacy for a second term at the Bi-Lo Center Monday, Aug. 26, 2013, in Greenville , S.C. Supporting Gov. Haley were Perry, Bobby Jindal-La. and Scott Walker-Wis. (AP Photo/ Richard Shiro)
South Carolina Gov. Nikki Haley waits for President Barack Obama to speak before the National Governors Association, Monday, Feb. 27, 2012, in the State Dining Room of the White House in Washington. (AP Photo/Susan Walsh)
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Nikki Haley

Haley's name was added to the list on Wednesday, according to MSNBC host Joe Scarborough. The South Carolina governor has become a rising star within the Republican party in recent years.

She delivered a well-received rebuttal to President Barack Obama's State of the Union address this year, calling for unity seeming to negate Trump's campaign tactics by urging people to "resist the temptation" of following the "siren call of the angriest voices." She also took a swipe at anti-immigrant rhetoric, saying that "no one who is willing to work hard, abide by our laws, and love our traditions should ever feel unwelcome in this country."

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