Trump lashes out at '13 angry Democrats'
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President TrumpDonald John TrumpNational Archives says it altered Trump signs, other messages in Women's March photo Dems plan marathon prep for Senate trial, wary of Trump trying to 'game' the process Democratic lawmaker dismisses GOP lawsuit threat: 'Take your letter and shove it' MORE on Sunday lashed out on Twitter at special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay MORE's investigation, referring to the "13 Angry Democrats" on the probe and writing that they should have been working to investigate Hillary ClintonHillary Diane Rodham ClintonSupreme Court agrees to hear 'faithless elector' cases Poll: Sanders holds 5-point lead over Buttigieg in New Hampshire Climate 'religion' is fueling Australia's wildfires MORE controversies.

The Sunday tweet comes as the president has expressed anger and frustration about the FBI's use of an informant in its investigation of Russia's meddling in the 2016 election. Trump and his allies have claimed the use of the informant was an act of politically motivated espionage.

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"Why didn’t the 13 Angry Democrats investigate the campaign of Crooked Hillary Clinton, many crimes, much Collusion with Russia?" he tweeted. "Why didn’t the FBI take the Server from the DNC? Rigged Investigation!"

Trump has used the "13 angry Democrats" term to refer to people on Mueller's probe who he believes are biased against him.

The president, most recently, sent a pair of tweets Saturday night lashing out at those members and casting doubt on Mueller's investigation into reported ties between Trump's campaign and Moscow.

"This whole Russia Probe is Rigged. Just an excuse as to why the Dems and Crooked Hillary lost the Election and States that haven’t been lost in decades. 13 Angry Democrats, and all Dems if you include the people who worked for Obama for 8 years. #SPYGATE & CONFLICTS OF INTEREST!" Trump wrote.

"When will the 13 Angry Democrats (& those who worked for President O), reveal their disqualifying Conflicts of Interest? It’s been a long time now! Will they be indelibly written into the Report along with the fact that the only Collusion is with the Dems, Justice, FBI & Russia?" he added in the second tweet. 

Mueller, a lifelong Republican, is in talks with Trump's legal team to set up a potential interview with the president, which could lead to the investigation's conclusion.

The use of the informant predated his appointment, though Trump attorney Rudy Giuliani on Sunday said it still "tainted" Mueller's probe.