Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) refused to swear off a 2020 presidential bid in an interview, arguing that it's "much too early" to make a decision.

"I am not taking it off the table, I just have not made any decisions. And I think it's much too early," he said in an interview set to air Thursday morning with SiriusXM Progress' "Make it Plain with Mark Thompson."

"Our job right now is to not only fight against this disastrous healthcare proposal, it is to take on all of [President] Trump’s reactionary proposals ... There's a whole lotta fights that we have to fight. It is just too early to be talking about an election 3 1/2 years from now."

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Sanders has repeatedly kept the door open for a 2020 run amid constant speculation that he will seek to run again after falling short in the 2016 Democratic primary. That speculation came to ahead once again this week when Sanders announced he would return to Iowa, where he fell just a few delegates short of winning the 2016 caucus, as part of his book tour later this summer.

Outside of his work in office, Sanders remains extremely active politically, rallying his supporters against Trump and pushing the Democratic Party to embrace his progressive agenda. He's continued to travel the country to support political candidates and an affiliated nonprofit, Our Revolution, works to advocate for his agenda and to back candidates up and down the ballot.

During the interview with SiriusXM, Sanders also shared his concerns about Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE Jr. and his decision to release an email transcript that appears to show him setting up a meeting with a Russian lawyer who offered damaging information about Democratic presidential hopeful Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE.

"From my point of view, it is a very damaging piece of evidence. But what is important is that there be a methodical, objective, bipartisan process that looks at this whole business of the possibility of Trump's campaign colluding with the Russians," he said.

"This is pretty clearly a damaging revelation, but the process has got to continue, and it will."