Is Bernie Sanders considering a 2020 run? 'Yes, is the answer'

Bernie Sanders might be considering running for president again.

When one of Sanders' associates was asked if the 75-year-old had begun to think about another run, the associate said, "Yes, is the answer."

SEE ALSO: Senator McCain's daughter says she went for a hike with father

Even though Sanders hasn't publicly said he has plans to run again, his actions might be confirming just that.

Sanders visited Iowa, a state he narrowly lost to Hillary Clinton during the Democratic primary, and has plans to visit again to promote his new book "Bernie Sanders: Guide to Political Revolution."

RELATED: Bernie Sanders on the campaign trail in 2016

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PHOENIX, AZ - MARCH 15: Democratic presidential candidate Sen. Bernie Sanders (D-VT) speaks to a crowd gathered at the Phoenix Convention Center during a campaign rally on March 15, 2016 in Phoenix, Arizona. Hillary Clinton won the Democratic primary elections in Florida, North Carolina and Ohio, while Missouri and Illinois remain tight races. (Photo by Ralph Freso/Getty Images)
DES MOINES, IA - JANUARY 26: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to the media after holding a campaign event with United Steelworkers Local 310L, on January 26, 2016 in Des Moines, Iowa. Sanders continues his quest to become the Democratic presidential nominee.. (Photo by Joe Raedle/Getty Images)
TOPSHOT - US Senator and Democratic Presidential Candidate Bernie Sanders speaks during a campaign event at the University of Northern Iowa in Cedar Falls, Iowa, January 24, 2016, ahead of the Iowa Caucus. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, participates in the Democratic presidential candidate debate in Charleston, South Carolina, U.S., on Sunday, Jan. 17, 2016. Hours before Sunday's Democratic debate, the two top Democratic contenders held a warm-up bout of sorts in multiple separate appearances on political talk shows, at a time when the polling gap between the pair has narrowed in early-voting states. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
NEW YORK, NY - JANUARY 05: Democratic presidential candidate Sen. Bernie Sanders (I-VT) shakes hands with supporters after outlining his plan to reform the U.S. financial sector on January 5, 2016 in New York City. Sanders is demanding greater financial oversight and greater government action for banks and individuals that break financial laws. (Photo by Andrew Burton/Getty Images)
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Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks at the Congressional Hispanic Caucus Institute conference in Washington, D.C., U.S., on Wednesday, Oct. 7, 2015. While next Tuesday's first Democratic presidential debate will probably lack the name-calling and sharp jabs of the Republican face-offs, there's still potential for strong disagreements between the party's leading contenders. Photographer: Andrew Harrer/Bloomberg via Getty Images
Democratic Presidential candidate Senator Bernie Sanders speaks about the Workplace Democracy Act on Capitol Hill in Washington, DC on October 6, 2015. AFP PHOTO/JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
US Senator from Vermont and Democratic presidential candidate Bernie Sanders addresses striking low-wage contract workers from the US Capitol and religious leaders at the Lutheran Church of the Reformation in Washington, DC, on September 22, 2015 for an interfaith service ahead of the arrival of Pope Francis for a six-day visit to the US. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
MANCHESTER, NH - SEPTEMBER 19: Democratic Presidential candidate Senator Bernie Sanders (I-VT) talks on stage during the New Hampshire Democratic Party State Convention on September 19, 2015 in Manchester, New Hampshire. Five Democratic presidential candidates are all expected to address the crowd inside the Verizon Wireless Arena. (Photo by Scott Eisen/Getty Images)
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He's also held campaign-style rallies in West Virginia, Kentucky and even toured across Republican-heavy states.

Sanders' campaign manager, Jeff Weaver, said Bernie Sanders is "keeping the door open" for a second White House run. The Vermont Senator is an independent, but if he does decide to run, one former campaign advisor believes he will run as a Democrat.

Some recent polls suggest Sanders and former Vice President Joe Biden would be favorites in a 2020 race against President Trump.

One associate said, "The last thing he's going to do is step aside and let Joe Biden take it."

RELATED: Joe Biden through the years

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Washington, DC. 6-9-1987 Senator Joe Biden (D.,DE.) announces his candidacy for president. Credit: Mark Reinstein (Photo by Mark Reinstein/Corbis via Getty Images)
Sens. Joe Biden, D-Del., and Strom Thurmond, R-S.C. September 9, 1990 (Photo by Maureen Keating/CQ Roll Call via Getty Images)
Democratic politician Joseph R. Biden Jr, the United States Senator from Delaware, circa 1980. He became the US Vice President in 2009 under President Barack Obama. (Photo by Nancy Shia/Archive Photos/Getty Images)
American politician and US Senator (and future US Vice President) Joe Biden smiles in a 'Bicentennial Minutes' segment, a series of nightly shorts commemorating the bicentennial of the American Revolution which aired from 1974-1976, August 12, 1974. (Photo by CBS Photo Archive/Getty Images)
WASHINGTON, : US Senator Joe Biden(D-DE) briefs reporters prior to the 15 January start of the second day of the US Senate impeachment trial of US President Bill Clinton on Capitol Hill in Washington, DC. House prosecutors will summarize their case against the president 15 January. (ELECTRONIC IMAGE) AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)
392389 02: U.S. President George W. Bush meets with members of the Senate and House foreign policy leadership in the Cabinet room at the White House July 25, 2001 in Washington, DC. Seated next to the president is Sen. Joe Biden (D-DE). (Photo by Mark Wilson/Getty Images)
UNITED STATES - MARCH 08: Joe Biden during the 2004 Democratic National Convention in Boston, Massachusetts. (Photo By Douglas Graham/Roll Call/Getty Images)
UNITED STATES - MAY 12: Democrat vice chairman of the Senate Foreign Relations Committee Senator Joe Biden (D-DE), throws up his hands as he speaks during debate on the nomination of John Bolton as US Ambassador the the United Nations May 12, 2005 in Washington D.C. (Photo by Joe Marquette/Bloomberg via Getty Images)
WASHINGTON - JULY 12: U.S. Senator Joseph Biden (D-DE) speaks during the Senate Foreign Relations Committee hearing on 'North American Cooperation on the Border' on the Border' on Capitol Hill July 12, 2005 in Washington, DC. The committee discussed border security and how to work together to secure the borders with Mexico and Canada. (Photo by Joe Raedle/Getty Images)
THE TONIGHT SHOW WITH JAY LENO -- Episode 3331 -- Pictured: (l-r) Senator Joe Biden during an interview with host Jay Leno on March 22, 2007 (Photo by Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
ORANGEBURG, SC - APRIL 26: (L-R) U.S. Sen. Joe Biden (D-DE) and New Mexico Gov. Bill Richardson greet the crowd before the start of the first debate of the 2008 presidential campaign April 26, 2007 at South Carolina State University in Orangeburg, South Carolina. The debate, featuring eight Democratic presidential candidates, comes 263 days before the first ballot will be cast in the Iowa caucus next January. (Photo by Justin Sullivan/Getty Images)
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US Vice President Joe Biden speaks during the Civil Society Forum on the sideline of the US-Africa Leaders Summit in Washington, DC, on August 4, 2014. Washington aims to wake up US business to the opportunities in Africa with the landmark US-Africa Leaders Summit this week, as China and Europe steal a march on the world's fastest-growing continent. As many as four dozen African leaders, and hundreds of businessmen with them, will for their part be looking to see if US investors and traders can move beyond old stereotypes of a continent mired in conflict and corruption and recognize its huge potential. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
WASHINGTON, DC - AUGUST 18: U.S. Vice President Joe Biden (R) swears in Secretary of Housing and Urban Development Julian Castro (L) as his wife Erica and daughter Carina look on during a ceremonial swearing in ceremony in the Eisenhower Executive Office Building August 18, 2014 in Washington, DC. Castro, the former Mayor of San Antonio, Texas, was officially sworn in on July 28. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - JUNE 30: (AFP OUT) U.S. President Barack Obama (C), Robert McDonald (R) and Vice President Joe Biden walk back to the White House through LaFayette Park after President Obama announced his intention to nominate Robert McDonald to lead the Department of Veterans Affairs June 30, 2014 in Washington, DC. McDonald served as the chief executive of Procter & Gamble and will replace Eric Shinseki who resigned after allegations of delayed care came to light. (Photo by Dennis Brack-Pool/Getty Images)
US President Barack Obama speaks to US Vice President Joe Biden after Biden introduced him during a signing ceremony for H.R. 803, the Workforce Innovation and Opportunity Act, on July 22, 2014 in the South Court Auditorium of the Eisenhower Executive Office Building, next to the White House in Washington, DC. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US Presidential Barack Obama speaks on immigration reform beside US Vice President Joe Biden (R) in the Rose Garden of the White House on June 30, 2014 in Washington, DC. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
COLORADO SPRINGS, CO - MAY 28: Vice President of the United States Joe Biden takes a selfie after the commencement ceremony at Air Force Academy in Colorado Spring, May 28, 2014. Biden spoke during the ceremony. (Photo by RJ Sangosti/The Denver Post via Getty Images)
US Vice President Joe Biden gestures as he speaks at Ledra palace in the UN-patrolled Buffer Zone in Nicosia on May 22, 2014. Biden met Cyprus leaders Thursday to spur talks on ending the island's 40-year division and seek support for threatened sanctions against Russia despite the economic cost. AFP PHOTO/ ANDREW CABALLERO-REYNOLDS (Photo credit should read Andrew Caballero-Reynolds/AFP/Getty Images)
US Vice President Joe Biden adresses a speech to students and officials at Cotroceni Palace, the Romanian Presidency headquarters in Bucharest on May 21, 2014. Tougher sanctions must be imposed on Russia if it undermines crucial presidential elections in Ukraine on May 25, 2014, US Vice President Joe Biden said in Bucharest. AFP PHOTO DANIEL MIHAILESCU (Photo credit should read DANIEL MIHAILESCU/AFP/Getty Images)
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US Vice President Joe Biden (L) and outgoing Heath and Human Services Secretary Kathleen Sebelius applaud as President Barack Obama names Sylvia Mathews Burwell (R), his current budget director, to replace Sebelius in the Rose Garden at the White House in Washington,DC on April 11, 2014. Sebelius resigned, paying the price for the chaotic initial rollout of the US president's signature health care law. AFP PHOTO/Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US Vice President Joe Biden waves upon arrival for a meeting with Lithuania's President in Vilnius on March 19, 2014. Biden meets today with Lithuanian President Dalia Grybauskaite and Latvian leader as part of a tour to reassure NATO allies during the Ukraine crisis. AFP PHOTO / PETRAS MALUKAS (Photo credit should read PETRAS MALUKAS/AFP/Getty Images)
US Vice President Joe Biden listens during a meeting with the Polish Prime Minister in Warsaw, Poland on March 18, 2013. Biden arrived in Poland for talks with regional allies as Russia tightened its grip on the Ukraine's breakaway region of Crimea. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)
US Vice President Joe Biden arrives for a St. Patrick's Day reception in the East Room of the White House on March 14, 2014 in Washington. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US Vice President Joe Biden during a joint press conference with Chile's President Sebastian Pinera (not framed) at La Moneda presidential palace in Santiago, on March 10, 2014. AFP PHOTO/CLAUDIO REYES (Photo credit should read Claudio Reyes/AFP/Getty Images)
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U.S. Vice President Joe Biden, left, looks on as President Barack Obama speaks at the White House in Washington, D.C., U.S., on Friday, Jan. 31, 2014. Obama is meeting today with chief executive officers of companies from Bank of America Corp. to EBay Inc. who have committed to giving the long-term unemployed a better chance in the hiring process. Photographer: Joshua Roberts/Bloomberg via Getty Images *** Barack Obama; Joe Biden
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WASHINGTON, DC -� APRIL 26: Former Vice President, Joe Biden and Mark Ein are seen at the game between the Washington Wizards and the Atlanta Hawks in Game Five of the Eastern Conference Quarterfinals of the 2017 NBA Playoffs on April 26, 2017 at Verizon Center in Washington, DC. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2017 NBAE (Photo by Scott Cunningham/NBAE via Getty Images)
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