Paul Ryan

House Speaker Paul Ryan, R-Wis., talks during an interview with The Associated Press Thursday, June 2, 2016, in Janesville, Wis. (AP Photo/Andy Manis)

As the FBI reopened an investigation into Hillary Clinton's use of a private email server while secretary of state, House Speaker Paul Ryan said she betrayed Americans' trust in the way she handled "the nation's most important secrets."

Ryan said the FBI's probe is "long overdue" and he called for additional action, including suspending the national security briefings she receives as a presidential candidate.

"This decision, long overdue, is the result of her reckless use of a private email server, and her refusal to be forthcoming with federal investigators," Ryan said in a statement. "I renew my call for the Director of National Intelligence to suspend all classified briefings for Secretary Clinton until this matter is fully resolved."

FBI Director James Comey on Friday said newly discovered emails have prompted the bureau to reopen the investigation into Clinton's use of a private server during her tenure as secretary of state.

Comey made the announcement 11 days before the election in an letter sent to eight congressional committee chairmen.

"In connection with an unrelated case, the FBI has learned of the existence of emails that appear pertinent to the investigation," Comey said in the letter. "I am writing to inform you that the investigative team briefed me on this yesterday, and I agreed that the FBI should take appropriate investigative steps designed to allow investigators to review these emails to determine whether they contain classified information, as well as to assess their importance to our investigation."