GOP Rep. Trey Gowdy said Thursday that there is “sufficient factual basis” to investigate why former FBI Director James Comey decided not to charge Hillary Clinton before interviewing key witnesses.

“There is sufficient factual basis to bring him in and ask him, ‘When did you make up your mind that you weren’t going to charge Secretary Clinton?’ I can tell you because I’ve seen with my own eyes he made up his mind before he interviewed her,” Gowdy told Fox News. “How far back, whether it was two weeks or two months, quite frankly is immaterial to me. He did it before he interviewed the last witness.”

One of the first rules of an investigation is to hold off on a final conclusion until reviewing all evidence that witnesses present, something that Comey did not do, according to Gowdy.

“If there’s anything that’s axiomatic in investigations it’s that you don’t make up your mind until you interview the last witness. It is beyond dispute that he made up his mind not to charge Secretary Clinton before he interviewed her. There’s no question about that. What my friends in the Senate have uncovered is he may well have made up his mind before he interviewed the last dozen witnesses,” Gowdy said.

The congressman stopped short of agreeing with White House press secretary Sarah Huckabee Sanders that Comey was guilty, and said that if someone in the administration has evidence of wrongdoing, they should refer it to the Department of Justice.

“Alleging criminal violations is very serious which is why I don’t do it. Press secretaries don’t get to make that call. Members of Congress don’t get to make that call. Reporters don’t get to make that call. That’s an executive branch function after an investigation, a charging decision is made by a career prosecutor,” he said. “If it’s that clean and clear I’m sure she [Sanders] referred it to the Department of Justice.”

“How in the world my fellow citizens can have confidence in an investigation where you reached a conclusion before you even gather all the facts and all the evidence is stunning,” Gowdy said.

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