Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) hit President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for appearing to change his stance on issues like Russia, saying it’s "hard to comment on anything that Trump says because he could change his mind tomorrow."

Sanders told CBS’s "Face the Nation" in an interview set to air Sunday that while Trump often walks back his statements, he was “absolutely outraged by his behavior in Helsinki, where he really sold the American people out.”

The senator said Trump’s comments on Russia's election interference make him believe “that either Trump doesn't understand what Russia has done, not only to our elections, but to cyberattacks against all parts of our infrastructure.”

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“Either he doesn't understand it, or perhaps he is being blackmailed by Russia because they may have compromising information about him or perhaps also, you have a president who really does have strong authoritarian tendencies and maybe he admires the kind of government that Putin is running in Russia,” Sanders said.

Sanders is not the first Trump critic to suggest the Russians have information on Trump. The theory was fomented, before the election, in part by the Steele dossier, which makes salacious claims about Trump's associations with Russia.

"And I think all of that is a disgrace and a disservice to the American people," Sanders continued. “And we have got to make sure that Russia does not interfere, not only in our elections, but in other aspects of our lives."

Trump drew widespread criticism after he appeared to side with Russian President Vladimir Putin’s denials of interference in the 2016 election during a joint press conference with the leader on Monday.

He moved to walk back the comments with a statement on Tuesday, telling reporters that he misspoke and that he accepts the U.S. intelligence community’s conclusion that Russia interfered in the election.

“Could be other people also,” Trump added.