Judicial Watch President Tom Fitton testified Thursday before a House Oversight panel, saying there is enough evidence to warrant a "serious investigation" of pay-to-play allegations against the Clinton Foundation.

He also told lawmakers he believes the Justice Department suppressed potential probes into the allegations, some of which were uncovered by Judicial Watch, in 2016.

Fitton said on "Fox & Friends First" Friday that when Hillary Clinton became secretary of state in 2009, there were concerns about money being paid through the foundation for speeches by Bill Clinton.

Fitton: Congress Failed in Its Oversight of Rosenstein, DOJ

Dershowitz: Cohen Doesn't Seem to Understand the Difference Between 'Wrong' and 'Illegal'

He recalled that Clinton promised there would be an ethics process in place and that she would not have any involvement with the foundation while serving as the nation's top diplomat.

But Fitton said subsequent documents requests, including emails from Clinton's private server, show that "was not the case."

"The Clinton Foundation was a vehicle in many ways for foreign nationals and foreign governments to influence the secretary of state," he explained.

Democrats dismissed the hearing as a partisan exercise. The Clintons and the foundation have long denied accusations of impropriety.

Fitton said the hearing was "better late than never," since Democrats will take control of the House next month. Republicans emphasized that donations to the foundation plummeted after Clinton lost the election in 2016, arguing that bolsters their suspicions about prior contributions.

Rep. Mark Meadows (R-N.C.) expressed frustration that U.S. Attorney John Huber, the prosecutor appointed last year to investigate the foundation, did not accept an invitation to appear at the subcommittee hearing.

During the hearing, Fitton called attention to reports of "staggering sums" flowing to the foundation from Saudi donors.

"While Mrs. Clinton was secretary of state, Bill Clinton gave two speeches in Saudi Arabia earning a total of $600,000," he said.

Meadows told Fox News last week three people had turned over hundreds of pages of evidence of potential wrongdoing by the foundation, including misappropriation of funds and allegations of quid-pro-quo promises made to donors during Clinton's tenure as secretary of state.

Watch Heather Childers' interview above.

'Time to Shut It Down': Fitton Calls on Congress to Bring Mueller in to Testify

'How Nice of Him': Gutfeld Blasts Ted Lieu's Wish to Regulate Speech