Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) fact-checked President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s tweet claiming that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s probe is “phony,” noting that it has led to several indictments and guilty pleas.

“I hate repeating myself Mr. President, but let me remind you again: Special Counsel Mueller’s investigation has either indicted or secured guilty pleas from 19 people and three companies — that we know of,” Schumer tweeted Sunday.

Trump attacked Mueller’s probe as the “phony Russia Collusion Witch Hunt” earlier Sunday, mourning the “young and beautiful lives” he claims have been “devastated and destroyed” by the investigation.

ADVERTISEMENT

Three Trump campaign staffers or officials have pleaded guilty to charges in the probe, including former national security adviser Michael Flynn as well as former campaign advisers George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE and Richard Gates.

Lawyer Alex van der Zwaan also pleaded guilty to lying to investigators about his contact with Gates, and a California man, Richard Pinedo, pleaded guilty to identity fraud for selling bank account numbers.

Former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE has also been charged in the probe.

Mueller has also indicted 13 Russian nationals and three Russian organizations for allegedly working to interfere in the 2016 election.

Trump has repeatedly attacked the probe as a "witch hunt" and claimed that it is biased against him. More recently, he has made unsubstantiated claims that the FBI spied on his campaign, although top Obama-era intelligence officials have disputed the allegations.