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.) fired back at 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 on Monday after Trump said special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE should not testify before Congress about his investigation into Russia's election interference.

Sanders said in a tweet that Trump is “not a dictator” and does not get to determine whether or not Mueller will testify.

“Sorry, Mr. President, you are not a dictator,” Sanders wrote. “In our democracy, when Congress calls on Robert Mueller to testify, he will testify.”

Sorry, Mr. President, you are not a dictator. In our democracy, when Congress calls on Robert Mueller to testify, he will testify. https://t.co/hGhU9PlAXR — Bernie Sanders (@SenSanders) May 6, 2019

Mueller could testify before Congress sometime this month on the findings of his 22-month long investigation.

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Trump on Twitter Sunday alleged Democrats seeking to have Mueller testify are looking for a “redo” after the special counsel's report concluded Trump did not collude with Russia to influence the 2016 election.

Trump previously said it was up to Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE to decide whether the special counsel would testify.

Barr had said he had no objection to Mueller testifying before Congress.