The FBI agent removed from the special counsel investigation into Russian meddling in the U.S. presidential election lambasted then-presidential candidate Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) and former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE in texts to an FBI lawyer, as well as his previously reported negative remarks about 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.

Found in the 375 text messages given to Congress by the Justice Department, senior counterintelligence agent Peter Strzok reportedly called supporters of Sanders "idiots," as reported Thursday by Wall Street Journal.

Strzok and attorney Lisa Page also panned Holder, who would have once been their boss at the Justice Department.

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During Holder's speech at the Democratic National Convention, Strzok texted, “Oh God, Holder! Turn it off turn if off!!!"

Republicans have seized on text messages from Strzok insulting Trump as evidence of political bias in the special counsel probe, from which he has been removed, as well as the FBI's investigation into Clinton's use of a private email server while secretary of State.

Strzok called Trump an "utter idiot" and a "loathsome human" in texts the Justice Department provided to reporters and Congress.

“These text messages prove what we all suspected — high-ranking FBI officials involved in the Clinton investigation were personally invested in the outcome of the election and clearly allowed their political opinions to cloud their judgment,” House Judiciary Committee Chairman Bob Goodlatte Robert (Bob) William GoodlatteNo documents? Hoping for legalization? Be wary of Joe Biden Press: Trump's final presidential pardon: himself USCIS chief Cuccinelli blames Paul Ryan for immigration inaction MORE (R-Va.) said on Wednesday.