Rep. Peter King (R-NY) says that he's "confident" that the American people will learn of "severe, serious abuses" carried out by the FBI and CIA against President Trump and his campaign during the 2016 US election.

Speaking with New York radio host an billionaire John Catsimatidis, King said "There was no legal basis at all for them to begin the investigation of his campaign," when asked about the ongoing probe by Attorney General William Barr, referring to the FBI's application for a FISA warrant to spy on former Trump campaign adviser Carter Page.

"Just from evidence I’ve seen over the last several years being on the Intelligence Committee, being a member of Congress," said King, "there’s no doubt to me there were severe serious abuses that were carried out in the FBI, and I believe the top levels of the CIA."

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While Democrats dispute that anything untoward took place against Trump or his campaign, Republicans have called out the FBI for relying on an unverified dossier compiled, and possibly fabricated, by a former UK spy on behalf of the Clinton campaign.

Republicans, including California Rep. Devin Nunes, claimed that federal authorities did not fully disclose their reliance on an unverified dossier compiled by Christopher Steele, which was part of opposition research for Hillary Clinton’s campaign. Democrats dispute the notion that anything improper took place. They claim the dossier did not play a major role, and point to a footnote in the warrant application that acknowledged that some of the information came from research on Trump that was likely meant to hurt his campaign, even if it did not spell out exactly who paid for it. Republicans are now waiting on a report from Justice Department Inspector General Michael Horowitz, following an investigation of possible FBI abuses of the FISA system. Fox News has learned that key witnesses have come forward, after previously holding out. -Fox News

Meanwhile, special counsel Robert Mueller is set to appear on July 17 before the House Intelligence Committee, where he will face questions about his investigation into the events surrounding the 2016 US election.