Trump: Republicans should 'take control' of Russia investigation

President TrumpDonald John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti MORE on Wednesday called on Republicans to “take control” of the investigation into whether his campaign colluded with Russia and labeled the ongoing probe the “single greatest Witch Hunt in American history.”

“There was no collusion, everybody including the Dems knows there was no collusion, & yet on and on it goes. Russia & the world is laughing at the stupidity they are witnessing. Republicans should finally take control!” Trump tweeted.

Trump has repeatedly labeled special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE’s investigation a witch hunt and has denied colluding with Russia during the presidential race. Last month Trump said even if there was collusion, “it’s not a crime.” He has also suggested the FBI instead investigate his 2016 opponent, Democratic nominee Hillary ClintonHillary Diane Rodham ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) MORE.

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In a tweet earlier Wednesday, Trump lashed out at Sen. Dianne FeinsteinDianne Emiel FeinsteinDHS chief takes heat over Trump furor NSA spying program overcomes key Senate hurdle Democrats will need to explain if they shut government down over illegal immigration MORE (D-Calif.) for unilaterally releasing the full transcript of an interview between congressional investigators and the co-founder of the opposition research firm that commissioned a controversial dossier on Trump during the 2016 campaign.

Democrats have claimed the dossier to be a roadmap to alleged collusion and corruption by Trump and his officials, while Republicans insist that it is full of unverified claims that the FBI might have used to improperly secure a warrant to spy on Trump’s campaign and transition.

Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyGOP senators eager for Romney to join them Five hurdles to a big DACA and border deal Grand jury indicts Maryland executive in Uranium One deal: report MORE (R-Iowa), who chairs the Senate Judiciary Committee, said he's not sure what the president had in mind with his comments, adding that he doesn’t plan to follow up with Trump on the matter.

“I don’t intend to have a discussion with the president on that point and I hope he doesn’t call me and tell me the same thing that you said he said,” Grassley told CNN’s Manu Raju on Wednesday when told about Trump's tweet.

The Judiciary Committee is one of several congressional committees conducting separate investigations into Russian meddling in the 2016 election.

Some GOP lawmakers have in recent weeks accused the Mueller probe of bias against the president, citing anti-Trump text messages sent by a former member of Mueller's team.

It was recently reported that Trump’s team is discussing options for a possible interview with Mueller in the coming weeks.

Mueller’s investigation has thus far led to two indictments and two guilty pleas. 

Former Trump campaign chairman Paul ManafortPaul John Manafort'Total free-for-all' as Bannon clashes with Intel members Overnight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector Manafort associate Richard Gates no longer under home confinement MORE and his former associate, Richard Gates, were indicted on money laundering and tax fraud charges, among others.

Former White House national security adviser Michael Flynn and former Trump campaign policy adviser George PapadopoulosGeorge Demetrios PapadopoulosTrump tweets 'Russian Collusion Hoax is dead' as Bannon set to testify Clinton campaign deserves a full investigation just like Trump World Lewandowski says he'll testify this week before Congress on Russia MORE pleaded guilty to lying to the FBI.

Updated: 11:57 am.