Bernie Sanders hasn't taken challenging Trump in 2020 off the table

Bernie Sanders says he is not ruling out another presidential run for in 2020.

The Vermont senator told Mark Thompson on his SiriusXM show on Thursday, "No, I'm not taking it off the table, I just have not made any decisions."

But Sanders did follow his statement up by saying that it was too early to speculate.

Other top prospects who may run against Trump in 2020:

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People who might run against Trump in 2020
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People who might run against Trump in 2020

Former Vice President Joe Biden

(Photo by Patrick T. Fallon/Bloomberg via Getty Images)

Sen. Bernie Sanders (I-Vt.)

(Photo by Scott Eisen/Getty Images)

Sen. Elizabeth Warren (D-Mass.)

(Photo by Craig F. Walker/The Boston Globe via Getty Images)

Sen. Kamala Davis (D-Calif.)

(Photo By Bill Clark/CQ Roll Call)

Sen. Chris Murphy (D-Conn.)

(Photo by Zach Gibson/Getty Images)

Sen. Amy Klobuchar (D-Minn.)

(Photo by Drew Angerer/Getty Images)

Facebook CEO and founder Mark Zuckerberg

(Photo by David Paul Morris/Bloomberg via Getty Images)

Sen. Cory Booker (D-N.J.)

(Photo by Jason LaVeris/FilmMagic)

Sen. Kirsten Gillibrand (D-N.Y.)

(Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)

Colorado Gov. John Hickenlooper

(Photo By Bill Clark/CQ Roll Call)

New York Gov. Andrew Cuomo

(Photo credit MENAHEM KAHANA/AFP/Getty Images)

Former Maryland Gov. Martin O'Malley

(Photo credit NICHOLAS KAMM/AFP/Getty Images)

Former Housing and Urban Development Secretary Julian Castro

(Photo by Pete Marovich/Bloomberg via Getty Images)

Sen. Tim Kaine (D-Va.)

(Photo by Daniel Acker/Bloomberg via Getty Images)

Sen. Al Franken (D-Minn.)

(Photo by Zach Gibson/Getty Images)

Sen. Al Franken (D-Minn.)

(Photo credit ZACH GIBSON/AFP/Getty Images)

Former Massachusetts Gov. Deval Patrick

(Photo by Suzanne Kreiter/The Boston Globe via Getty Images)

New York City Mayor Bill de Blasio

(Photo by James Keivom/NY Daily News via Getty Images)

Dallas Mavericks owner Mark Cuban

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Environmental activist Tom Steyer

(Photo by David Paul Morris/Bloomberg via Getty Images)

Democratic National Committee Chairman Tom Perez

(Photo by Taylor Hill/FilmMagic)

Minnesota Gov. Mark Dayton 

(Photo by Stephen Maturen/Getty Images)

Virginia Gov. Terry McAuliffe

(Photo by Drew Angerer/Getty Images)

California Lt. Gov. Gavin Newsom

(Photo by Yichuan Cao/NurPhoto via Getty Images)

Facebook COO Sheryl Sandberg

(Photo credit FABRICE COFFRINI/AFP/Getty Images)

Starbucks CEO Howard Schultz

(Photo by Stephen Brashear/Getty Images)

Former first lady Michelle Obama

(Photo by Gerardo Mora/Getty Images)

Dwayne "The Rock" Johnson

(Photo by Donna Ward/Getty Images)

Rep. Tulsi Gabbard (D-Hawaii)

(Photo credit TIMOTHY A. CLARY/AFP/Getty Images)

Rep. Keith Ellison (D-Minn.)

(Photo by Alex Wong/Getty Images)

Rep. Sean Patrick Maloney (D-N.Y)

(Photo By Tom Williams/CQ Roll Call)

California Gov. Jerry Brown

(Photo by Tiffany Rose/Getty Images for Caruso )

Media mogul Oprah Winfrey

(Photo by Moeletsi Mabe/Sunday Times/Gallo Images/Getty Images)

Former Sen. Russ Feingold (D-Wis.)

(Photo By Tom Williams/CQ Roll Call)

Former Vermont Gov. Howard Dean

(Marcus Yam / Los Angeles Times)

Former Vice President Al Gore

(Photo credit DAVID MCNEW/AFP/Getty Images)

Sen. Mark Warner (D-Va.)

(Photo by Katherine Frey/The Washington Post via Getty Images)

Former Sen. Jim Webb (D-Va.)

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Los Angeles Mayor Eric Garcetti

(Photo by Rodin Eckenroth/Getty Images,)

Rep. Seth Moulton (D-Mass.)

(Photo by Craig F. Walker/The Boston Globe via Getty Images)

New Orleans Mayor Mitch Landrieu

Albin Lohr-Jones/Pool via Bloomberg

Sen. Tammy Duckworth (D-Ill.)

(Photo by Scott Olson/Getty Images)

Washington Gov. Jay Inslee

(Photo by Karen Ducey/Getty Images)

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Sanders then shifted the focus of the conversation toward fighting the Senate's current healthcare bill and touched upon Donald Trump Jr.'s emails concerning a meeting with a Russian lawyer.

Calling it, "A very damaging piece of evidence," he went on to say that the entire possibility of Trump's campaign colluding with Russia should be looked at.

And while he still has some time to decide on another run at the presidency, Sanders is focused on the present, saying, "There's a whole lot of fights that we have to fight, it's just too early to be talking about an election three and a half years from now."

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