Sen. Bernie SandersBernie SandersHarris readies a Phase 2 as she seeks to rejuvenate campaign 2020 Dems put spotlight on disabilities issues Lee, Sanders introduce bill to tax Wall Street transactions MORE (I-Vt.) fired back at President TrumpDonald John TrumpFeinstein, Iranian foreign minister had dinner amid tensions: report The Hill's Morning Report - Trump says no legislation until Dems end probes Harris readies a Phase 2 as she seeks to rejuvenate campaign MORE on Monday after Trump said special counsel Robert MuellerRobert (Bob) Swan MuellerHouse progressive: Pelosi 'has it right' on impeachment Democrats talk subpoena for Mueller Democratic Rep. Ro Khanna: 'I'm not there yet' on impeachment 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 BarrThe Hill's Morning Report - Trump says no legislation until Dems end probes Harris readies a Phase 2 as she seeks to rejuvenate campaign Justin Amash confirms collusion witch hunt was all about politics MORE to decide whether the special counsel would testify.

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