Trump lashes out at '13 angry Democrats'
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President TrumpDonald John TrumpFlorida GOP lawmaker says he's 'thinking' about impeachment Democrats introduce 'THUG Act' to block funding for G-7 at Trump resort Kurdish group PKK pens open letter rebuking Trump's comparison to ISIS MORE on Sunday lashed out on Twitter at special counsel Robert MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network 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 ClintonState cites 38 people for violations in Clinton email review Trump campaign to hold rallies in Mississippi, Kentucky Biden struggles to reverse fall 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.