Ever since Donald Trump was sworn into office, he's been involved in constant controversy over a wide-range of issues. Trump's latest allegation accuses former President Barack Obama of wiretapping Trump Tower, which has led some at Fox News to question the commander in chief.

Fox News on Trump

After his first full month in office, Donald Trump was hit with yet another bombshell that linked a member of his administration to Russia. The Washington Post broke a story just two weeks ago which found that Attorney General Jeff Sessions was in contact with the Russian ambassador at least two different times during the election.

As a way to deflect from the scandal, the former host of "The Apprentice went on a multiple-tweet rant where he claimed, without evidence, that Obama ordered Trump Tower to be put under surveillance through wiretapping. In the aftermath, the White House has yet to release proof to back up the claim, as the mainstream media, as well as a bi-partisan consensus in Washington, D.C., have all pushed back at the president. As seen during the March 16 edition of "Tucker Carlson Tonight" on Fox News, one network contributor is opening up.

(Comments start at 1:40 in the video above.)

Joining Fox News host Tucker Carlson on Thursday night was network contributor and author Charles Krauthammer who didn't hold back when it came to the latest controversy surrounding Donald Trump.

After Carlson addressed the recent wiretapping issue and the backlash that has followed, Krauthammer said "It makes you question the credibility of the president on anything." "He really should stop digging," Krauthammer continued, before explaining that the heads of the House and Senate intelligence committees confirm that they "have not seen a shred of evidence that this is true."

Trump's Twilight Zone

Not stopping there, Charles Krauthammer went off on Donald Trump, saying that no one takes him seriously on his wiretapping claim, before bashing the billionaire real estate mogul for his belief in conspiracies.

"There’s not a person in Washington who thinks that there actually was a wiretap, that this is true," he said. "Look, he seems to have a belief in conspiracy theories...this is after-all, a man who said that Ted Cruz's father was involved, in some way, with Lee Harvey Oswald," Krauthammer noted, before labeling it "Twilight-zone stuff." While Fox News is usually a safe space for Trump, there have been certain hosts who have also been critical as of late, including Shepard Smith and Bret Baier.