Trump Jr. targets Obama administration, FBI in tweet

Donald Trump Jr.Donald (Don) John TrumpDemocrats introduce bill to block taxpayer-funded spending at Trump properties Trump dismisses NYT explanation on Kavanaugh correction The Hill's Morning Report - Trump takes 2020 roadshow to New Mexico MORE on Monday accused the Obama administration and the FBI of being corrupt as the latter continues its investigation into President TrumpDonald John TrumpJulián Castro: It's time for House Democrats to 'do something' about Trump Warren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest MORE.

Trump Jr.’s tweet comes days after the Justice Department notified lawmakers that the FBI failed to preserve six months' worth of texts from an agent who was removed from special counsel Robert MuellerRobert (Bob) Swan MuellerLewandowski 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 Mueller report fades from political conversation MORE’s team.

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Agent Peter Strzok, who also worked on the FBI’s investigation into Hillary ClintonHillary Diane Rodham ClintonMissing piece to the Ukraine puzzle: State Department's overture to Rudy Giuliani On The Money: Trump downplays urgency of China trade talks | Chinese negotiators cut US trip short in new setback | Trump sanctions Iran's national bank | Survey finds Pennsylvania, Wisconsin lost the most factory jobs in past year Meghan McCain, Ana Navarro get heated over whistleblower debate MORE’s use of a private email server, was removed last summer from Mueller’s probe into possible collusion between the Trump campaign and Russia after it was discovered he had sent anti-Trump messages.

Some Republicans have seized on the news as an indication that Mueller’s probe was biased against the president.

President Trump has frequently railed against the Mueller investigation, calling it a "witch hunt" and insisting there was no collusion.