President Trump on Tuesday asked why "deep state authorities" aren't looking into the handling of the investigation into then-Secretary of State Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE's emails, referencing a guest who had just appeared on Fox News.

“Charles McCullough, the respected fmr Intel Comm Inspector General, said the public was misled on Crooked Hillary Emails,” Trump tweeted. “Why aren’t our deep State authorities looking at this? Rigged and corrupt?”

Charles McCullough, the respected fmr Intel Comm Inspector General, said public was misled on Crooked Hillary Emails. “Emails endangered National Security.” Why aren’t our deep State authorities looking at this? Rigged & corrupt? @TuckerCarlson @seanhannity — Donald J. Trump (@realDonaldTrump) November 28, 2017

McCullough, who was appointed to his post by former President Obama, said in an interview on Monday with Fox News that he experienced pushback from Democrats when he tried to explain the seriousness of the investigation into Clinton’s emails.

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“I’ve heard people say this is overblown, I’ve heard people say this is much ado about nothing. Had the information been released, there would have been harm to national security,” McCullough said in the interview.

"There was personal blowback. Personal blowback to me, to my family, to my office,” McCullough told Fox News.

McCullough appeared Tuesday on “Tucker Carlson Tonight” to reiterate his claims, roughly an hour before Trump’s tweet.

The FBI concluded last year that it would not pursue criminal charges against Clinton for her “extremely careless” handling of classified materials while she was secretary of State.

Trump throughout the 2016 presidential campaign said Clinton should be prosecuted for using a personal server to handle classified emails.

Republican lawmakers have in recent weeks pressed Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE to appoint a special prosecutor to look into how the email case was handled.