House Intelligence Committee Chairman Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE (R-Calif.) said there's a good chance many countries gained access to Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE's email server while she was secretary of State.

"It's highly probable if you set up a server on the outside and you are a high-ranking government official, especially the secretary of State, that many countries got into that server," Nunes said in an interview on Hill.TV's "Rising" that aired Thursday.

"So, do I have specifics? No, but if I had to bet money, I would have said this back when we were looking for the 33,000 emails," he added.

Clinton's private email server has long been a target for Republicans.

Former Trump campaign adviser George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, who was the first guilty plea in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's probe into Russian election meddling, admitted to lying to the FBI about contact with Russian agents who offered the Trump campaign "thousands" of damaging emails about Clinton.

— Julia Manchester