Sen. Bernie SandersBernie SandersJoe Biden faces an uncertain path Bernie Sanders vows to go to 'war with white nationalism and racism' as president Biden: 'There's an awful lot of really good Republicans out there' MORE (I-Vt.) fired back at President TrumpDonald John TrumpO'Rourke: Trump driving global, U.S. economy into recession Manchin: Trump has 'golden opportunity' on gun reforms Objections to Trump's new immigration rule wildly exaggerated MORE on Monday after Trump said special counsel Robert MuellerRobert (Bob) Swan MuellerTrump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony Kellyanne Conway: 'I'd like to know' if Mueller read his own report 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.”

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 BarrWilliam Pelham BarrAttorney General Barr's license to kill Medical examiner confirms Epstein death by suicide Justice Dept. says Mueller report has been downloaded 800 million times MORE to decide whether the special counsel would testify.

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