In one email, Powell denounced Trump for perpetuating the "racist" birther movement that questioned President Barack Obama's US citizenship.
See Colin Powell through the years:
Colin Powell through his career
Colin Powell through his career
Chairman of the Joint Chiefs of Staff General Colin Powell (C) and members of the 132nd MP Company pose for photographs in Saudi Arabia December 22, 1990. REUTERS/Jonathan Bainbridge (SAUDI ARABIA - Tags: POLITICS) BEST QUALITY AVAILABLE
President George H.W. Bush meets with his military advisors at the Pentagon to duscuss the Gulf crisis August 15, 1990. From left are: General Norman Schwarzkopf, chief of Middle East forces, Defense Secretary Dick Cheney, Bush and Chairman of the Joint Chiefs of Staff Colin Powell. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS) BEST QUALITY AVAILABLE
Former U.S. Defense Secretary Richard Cheney and former Chairman of the
Armed Forces Joint Chiefs of Staff, Colin Powell (L), speak with reporters
about reductions in short range nuclear weapons during a press conference at
the Pentagon in this September 28, 1991 file photo. PP03030031
Arriving at the Ronald Reagan Presidential Library for award ceremonies November 9 are (L-R) former President Ronald Reagan , Alma Powell , Nancy Reagan and General Colin L. Powell , former Chairman of the Joint Chiefs of Staff
Republican presidential candidate Texas Governor George W. Bush (R) and retired General Colin Powell talk during a campaign stop in Pittsburgh, October 26, 2000. Bush hammered rival Democratic presidential candidate Vice President Al Gore on the responsibility of leadership.
Texas Governor and Republican presidential candidate George W. Bush listens to former chairman of the joint chiefs retired Gen. Colin Powell at VFW Post 3323 in Westland, Michigan, September 7, 2000. Powell praised Bush's plan to reinvigorate the U.S. military.
Richard Cheney, U.S. Defense Secretary during the Gulf War, and then Chairman of the Armed Forces Joint Chiefs of Staff, Colin Powell (R), address U.S. troops deployed in Saudi Arabia as part of operation Desert Shield during the Gulf crisis, in a December 21, 1990 file photo. According to reports, Republican presidential candidate George W. Bush decided on July 24, 2000 to offer the vice presidential spot on the Republican White House ticket to Cheney. Senior Republican sources in Washington said Bush would call Cheney soon and appear with him July 25. Cheney had previously told associates that if asked, he would accept the nomination. Bush had also been courting Powell for the Vice President's job, but Powell said he was not interested.
Musician Kenny G (center/right) stands with students of Macfarland Middle School (front), Charles Goldstock of Arista Records (left/rear), and General Colin Powell (ret.) (center), as he launches his new Foundation called Miracles by donating instruments to the school in Washington July 1. The mission of The Kenny G Miracles Foundation is to bring the miracle of music to America's youth by providing resources for school programs.
U.S. Secretary of State Colin Powell (R) points as he shakes hands with Russian Foreign Minister Igor Ivanov in Cairo February 24, 2001. Both men both men are expected to discuss arms control, Iraq and Middle East peace. Powell said his meeting with Ivanov would be a "get
acquainted session" and the start of the engagement between the new Bush administration and the Putin government in Moscow.
U.S. Secretary of State Colin Powell (R) laughs along with other U.S.
officials during ceremonies marking the 10th anniversary of Operation
Desert Storm in Kuwait City February 25, 2001. From left, are: former
National Security Adviser Brent Scowcroft, retired General Norman
Schwarzkopf, U.S. Ambassador to Kuwait James Larocco and Powell, a
retired general and former Joint Chiefs chairman during the Gulf war.
REUTERS/Royal Navy/Dave Coombs/Handout
U.S. Secretary of State Colin Powell presents an American proposal to help bring the Israeli-Palestinian conflict under control May 21, 2001. Powell said on Monday he had instructed his ambassador to Jordan, William Burns, to help Israelis and Palestinians build a "timeline" for peace and urged both sides to call an immediate and unconditional cease-fire.
U.S. Secretary of State Colin Powell testifies before the House
Appropriations subcommittee on the Departments of Commerce, Justice,
State and the Judiciary, on Capitol Hill in Washington March 26, 2003.
Powell testified for the State Department's 2004 budget as well as the
war in Iraq. REUTERS/Brendan McDermid
U.S. Secretary of State Colin Powell speaks on Iraq before members of
the House International Affairs Committee on Capitol Hill, September
19, 2002. President Bush warned today that the U.N. Security Council
must deal with Iraq or the United States and its allies would act
alone. REUTERS/Kevin Lamarque
U.N. Secretary-General Kofi Annan (2ndL) reads a final statement beside (L-R) Russian Foreign Minister Igor Ivanov, Spain's Foreign Minister Josep Pique, U.S. Secretary of State Colin Powell and EU Foreign Policy chief Javier Solana during their joint news conference at Moncloa Palace April 10, 2002. Leaders met to discuss the Middle East crisis.
WASHINGTON - OCTOBER 19: Former Secretary of State Gen. Colin Powell (ret.) speaks during a taping of 'Meet the Press' at NBC October 19, 2008 in Washington, DC. Secretary Powell spoke about his endorsement of Democratic presidential nominee U.S. Sen. Barack Obama (D-IL). (Photo by Brendan Smialowski/Getty Images for Meet The Press)
U.S. President Barack Obama meets with former Secretary of State Colin Powell in the Oval Office at the White House in Washington, December 1, 2010. REUTERS/Jim Young (UNITED STATES - Tags: POLITICS)
U.S. President Barack Obama and Vice President Joe Biden meet with former Secretary of State Colin Powell in the Oval Office at the White House in Washington, December 1, 2010. REUTERS/Jim Young (UNITED STATES - Tags: POLITICS)
Former Secretary of State Colin Powell stands over U.S. President Barack Obama during the signing of America's Promise Summit Declaration at the White House in Washington September 22, 2014. Powell served as the founding chairman of America's Promise Alliance which mobilizes non-profit groups, businesses, educators and communities to end high school dropout, and to prepare students for college and the workforce.
REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS EDUCATION)
Former US Secretary of State Colin Powell speaks alongside US Secretary of State Hillary Clinton during the unveiling of Powell's official State Department portrait in the Benjamin Franklin Room at the State Department in Washington, DC, on December 7, 2009. Powell served as Secretary of State from 2001-2005 under former US President George W. Bush. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
WASHINGTON - DECEMBER 07: Former U.S. Secretary of State Colin Powell walks by his official State Department portrait after an unveiling ceremony with U.S. Secretary of State Hillary Clinton in the Benjamin Franklin Room at the State Department December 7, 2009 in Washington, DC. Powell served as Secretary of State from 2001-2005 under former U.S. President George W. Bush. (Photo by Win McNamee/Getty Images)
Former US Secretaries of State Colin Powell (L) and Hillary Clinton speak during a ceremony to break ground on the US Diplomacy Center at the US State Department in Washington, DC, September 3, 2014. AFP PHOTO / Jim WATSON / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
WASHINGTON, DC - SEPTEMBER 03: Former Secretaries of State (L-R) Madeleine Albright, Colin Powell and Hillary Clinton share a laugh during the ceremonial groundbreaking for the future U.S. Diplomacy Center with former Secretary of State Colin Powell (L) at the State Department's Harry S. Truman Building September 3, 2014 in Washington, DC. When completed, the Diplomacy Center will be a museum and education center that will 'demonstrate the ways in which diplomacy matters now and has mattered throughout American history.' (Photo by Chip Somodevilla/Getty Images)
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"Yup, the whole birther movement was racist," Powell wrote, according to the BuzzFeed News report. "That's what the 99% believe. When Trump couldn't keep that up he said he also wanted to see if the certificate noted that he was a Muslim."
In another exchange, Powell went off on media — echoing the position of other lawmakers who believe the press helped fuel Trump's rise.
"You guys are playing his game, you are his oxygen," he said. "[Trump] outraged us again today with his comments on Paris no-go for police districts. I will watch and pick the timing, not respond to the latest outrage ..."
The real-estate mogul's controversial White House run has been unlike any other in modern history. Many of the campaign's highs and lows have been covered from every angle — much to the chagrin of the GOP nominee himself — who often rails against the coverage while simultaneously generating new headlines.
RELATED: See Trump through the years:
Donald Trump through the years
Donald Trump through the years
Real estate developer Donald Trump annouces intentions to build a $100 million dollar Regency Hotel. (Photo by John Pedin/NY Daily News via Getty Images)
UNITED STATES - MARCH 02: Donald Trump with Alfred Eisenpreis, New York City Economic Development Administrator. Sketch of new 1,400 room Renovation project of Commodore Hotel. (Photo by NY Daily News Archive via Getty Images)
NEW YORK, NY - 1980: Donald Trump and Ivana Trump attend Roy Cohn's birthday party in February 1980 in New York City. (Photo by Sonia Moskowitz/Getty Images)
UNITED STATES - MAY 26: Donald Trump stands behind architect's model of City Hall Plaza. (Photo by Frank Russo/NY Daily News Archive via Getty Images)
Donna Mills and Donald Trump during 1983 Annual American Image Awards at Sheraton Center in New York City, New York, United States. (Photo by Ron Galella, Ltd./WireImage)
Portrait of real estate mogul Donald John Trump (b.1946), smiling slightly and facing to his right, 1983. New York. (Photo by Bachrach/Getty Images)
New York real estate magnates Steve Ross, right, and Donald Trump, left, announce agreement, Thursday, August 1, 1985 in New York, to merge the Houston Gamblers and the New Jersey Generals United States Football League teams. Ross heads a group of investors that last week agreed to buy the troubled Houston franchise. (AP Photo/Marty Lederhandler)
Real estate magnate Donald Trump poses in front of one of three Sikorsky helicopters at New York Port Authority's West 30 Street Heliport on March 22, 1988. (AP Photo/Wilbur Funches)
Ivana Trump and Donald Trump during Mike Tyson vs Michael Spinks Fight at Trump Plaza - June 27, 1988 at Trump Plaza in Atlantic City, New Jersey, United States. (Photo by Ron Galella/WireImage)
Donald Trump and his wife, Ivana, pose outside the Federal Courthouse after she was sworn in as a United States citizen, May 1988. (AP Photo)
NEW YORK, NY - DECEMBER 4: Billionaire Donald Trump and his wife Ivana arrive 04 December 1989 at a social engagement in New York. (Photo credit should read SWERZEY/AFP/Getty Images)
Shown in photo is Donald Trump, Nov. 20, 1990. (AP Photo/Mark Lennihan)
Billionaire developer Donald Trump, right, waits with his brother Robert for the start of a Casino Control Commission meeting in Atlantic City, N.J., March 29, 1990. Trump was seeking final approval for the Taj Mahal Casino Resort, one of the world's largest casino complexes. (AP Photo)
Developer Donald Trump, center, is flanked by super middleweight champion Thomas Hearns, left, of Detroit, and Michael Olajide of Canada at a news conference in New York Thursday, Feb. 15, 1990. The three announced the super middleweight title bout at Trump Taj Mahal Casino Resort at Atlantic city, N. J on April 28.(AP Photo/Timothy Clary)
Real estate magnate Donald Trump and his girlfriend Marla Maples are seen at the Holyfield-Foreman fight at Trump Plaza in Atlantic City, N.J., April 19, 1991. (AP Photo)
Donald Trump and Daughter Ivanka Trump during Maybelline Presents 1991 Look of the Year at Plaza Hotel in New York City, New York, United States. (Photo by Ron Galella/WireImage)
NEW YORK, NY - APRIL 7: Donald Trump touches 07 April 1993 Marla Maples stomach to confirm published reports that the actress is pregnant with his child. The two arrived for Maples appearance in the Broadway musical 'The Will Rogers Follies'. (Photo credit should read HAI DO/AFP/Getty Images)
NEW YORK, NY - DECEMBER 21: US business tycoon Donald Trump(C) enters the PLaza Hotel in New York past supporters 21 December 1994. Hundreds of supporters showed up at a news conference where Trump denied a New York newspaper report that the Sultan of Brunei had bid 300 million USD to buy the Manhattan hotel. (Photo credit should read DON EMMERT/AFP/Getty Images)
FILE--This is a 1994 file photo of Donald Trump. Trump said Wednesday, Oct. 23, 1996 he has bought the Miss Universe, Miss USA and Miss Teen beauty pageants from ITT. ``It's a done deal,'' Trump said in a telephone interview. ``It's a very, very great entertainment format. It gets very high ratings, it's doing very well and we'll make it even better.'' Trump declined to say how much he paid. Asked if a New York Post source was correct in saying the deal was worth tens of millions of dollars, Trump replied, ``Why not? (AP Photo/Jim Cooper)
FLUSHING MEADOWS, UNITED STATES: Donald Trump and his girlfriend Celina Midelfar watch Conchita Martinez and Amanda Coetzer 07 September at US Open in Flushing Meadows, NY. AFP PHOTO Timothy CLARY (Photo credit should read TIMOTHY CLARY/AFP/Getty Images)
Donald Trump and Christine Whitman during Opening of New Warner Bros. Store in Trump Plaza Casino at Trump Plaza Casino in Atlantic City, New Jersey, United States. (Photo by Ron Galella/WireImage)
In this June 7, 1995 file photograph, Donald Trump is seen above the floor of the New York Stock Exchange after taking his flagship Trump Plaza Casino public in New York City. Trump Entertainment Resorts Inc., based in Atlantic City, New Jersey, filed for Chapter 11 protection on Tuesday, Feb. 17, 2009, in the U.S. Bankruptcy Court in New Jersey. Trump and his daughter Ivanka resigned from the company's board Friday, Feb. 13, 2009, after growing frustrated with bondholders. (AP Photo/Kathy Willens,File)
Celine Dion, husband Rene, Donald Trump & Ivanka Trump (Photo by KMazur/WireImage)
Entrepreneur Donald Trump watches an undercard fight as an unidentified companion whispers into his ear before the start of the Mike Tyson versus Francois Botha bout at the MGM Grand Hotel & Casino in Las Vegas, Nevada, Saturday, Jan. 16, 1999. (AP Photo/Eric Draper)
Developer Donald Trump holds an umbrella as he walks Saturday, Nov. 9, 2002, to the 11th green of the Ocean Trail Golf Club in Rancho Palos Verdes, Calif. Trump plans to turn the beleagured golf club into a world class course. Trump intends to close on the golf club by December and hopes to begin improvements by January. He could reopen the course, 20 miles south of Los Angeles, as early as June. (AP Photo/Damian Dovarganes)
Entrepreneur Donald Trump (L) and Rev. Al Sharpton speak at a ribbon cutting ceremony for Sharpton's National Action Network Convention April 5, 2002 in New York City. The group aims to further the development of civil rights. (Photo by Mario Tama/Getty Images)
Donald Trump and his girlfriend Melania Knauss attend the Marc Bouwer/Peta Fall/Winter 2002 Collection show February 14, 2002 during Mercedes-Benz Fashion Week in New York City. (Photo by George De Sota/Getty Images)
NEW YORK, UNITED STATES - DECEMBER 06: WBC Kampf im Schwergewicht 2003, New York/Madison Square Garden; Vitali KLITSCHKO/UKR - Kirk JOHNSON/CAN; Donald TRUMP als Zuschauer (Photo by Alexander Hassenstein/Bongarts/Getty Images)
FOXBORO, MA - JANUARY 10: Donald Trump stands on the sidelines before the start of the AFC divisional playoffs between the New England Patriots and Tennessee Titans on January 10, 2004 at Gillette Stadium in Foxboro, Massachusetts. Temperatures have reached as low as 7 degrees in the Foxboro area. (Photo by Al Bello/Getty Images)
US tycoon Donald Trump arrives to speak at the annual Conservative Political Action Conference (CPAC) at National Harbor, Maryland, outside Washington, on February 27, 2015. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
NASHVILLE, TN - APRIL 10: Donald Trump speaks during the NRA-ILA Leadership Forum at the 2015 NRA Annual Meeting & Exhibits on April 10, 2015 in Nashville, Tennessee. The annual NRA meeting and exhibit runs through Sunday. (Photo by Justin Sullivan/Getty Images)
WASHINGTON, DC - MARCH 24: Real estate mogul and billionaire Donald Trump attends Golf legend Jack Nicklaus' Congressional Gold Medal ceremony in the U.S. Capitol Rotunda March 24, 2015 in Washington, DC. Trump announed on March 18 that he has launched a presidential exploratory committee. (Photo by Chip Somodevilla/Getty Images)
DES MOINES, IA - MAY 16: Businessman Donald Trump speaks to guests gathered for the Republican Party of Iowa's Lincoln Dinner at the Iowa Events Center on May 16, 2015 in Des Moines, Iowa. The event sponsored by the Republican Party of Iowa gave several Republican presidential hopefuls an opportunity to strengthen their support among Iowa Republicans ahead of the 2016 Iowa caucus. (Photo by Scott Olson/Getty Images)
Developer Donald Trump displays a copy of his net worth during his announcement that he will seek the Republican nomination for president, Tuesday, June 16, 2015, in the lobby of Trump Tower in New York. (AP Photo/Richard Drew)
Republican presidential hopeful Donald Trump gives a thumbs up before boarding his campaign plane to depart from Laredo, Texas, Thursday, July 23, 2015. (AP Photo/LM Otero)
AYR, SCOTLAND - JULY 30: Republican Presidential Candidate Donald Trump visits his Scottish golf course Turnberry with his children Ivanka Trump and Eric Trump on July 30, 2015 in Ayr, Scotland. Donald Trump answered questions from the media at a press conference. (Photo by Jeff J Mitchell/Getty Images)