Trump lashes out at '13 angry Democrats'
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President TrumpDonald John TrumpTrump says he doesn't want to use 'adversary' to describe Russia Comey urges Americans to vote for Democrats in midterms Roby wins Alabama GOP runoff, overcoming blowback from Trump criticism MORE on Sunday lashed out on Twitter at special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 ClintonOvernight Defense: Trump tries to quell Russia furor | GOP looks to reassure NATO | Mattis open to meeting Russian counterpart Dem pollster: GOP women have a more difficult time winning primary races than Dems Mellman: (Mis)interpreting elections 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.