Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) pushed back Thursday against President Trump's claim that the special counsel to probe his campaign's ties to Russia represents the "single greatest witch hunt" in American political history.

"Mr. President, appointing a special counsel is not a witch hunt," Sanders tweeted.

"It's the right thing to do and your Republican colleagues agree."

Mr. President, appointing a special counsel is not a witch hunt. It's the right thing to do and your Republican colleagues agree. https://t.co/m2TLWL5iSQ — Bernie Sanders (@SenSanders) May 18, 2017

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Deputy Attorney General Rod Rosenstein appointed former FBI Director Robert Mueller Wednesday to act as a special counsel investigating Russia's involvement in the U.S. election.

After the announcement, Trump issued a measured statement saying that the federal investigation would find no collusion between his campaign and "any foreign entity."

But on Thursday, the president changed his tone.

“This is the single greatest witch hunt of a politician in American history!” Trump tweeted.

“With all of the illegal acts that took place in the Clinton campaign & Obama Administration, there was never a special councel [sic] appointed!” he said in another tweet.