Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) has postponed a briefing for members of Congress on the security of U.S. voting systems so that it can be classified.

The move comes after Democrats, including House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.), pressed GOP leadership to make the briefing classified so that officials could go into sufficient detail about the scope of the threat and the Trump administration’s efforts to protect digital election systems from hackers.

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Sources told The Hill that the briefing, originally scheduled for Thursday evening, has been pushed back as a result of logistical issues that prevented it from being classified. GOP leadership is now working to reschedule the briefing.

Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE, FBI Director Christopher Wray, and Director of National Intelligence Daniel Coats were originally scheduled to brief members on the Trump administration’s efforts to secure digital election infrastructure on Thursday at 5 p.m.

Ryan announced the briefing late Monday, amid widespread concerns about foreign threats to the midterm elections triggered by a Russian interference campaign in the 2016 vote that included cyber targeting of state election systems. The Speaker's announcement came on the eve of primaries in Pennsylvania, Nebraska, Idaho and Oregon.

The briefing was initially planned to be unclassified, but limited to members of Congress.

Rep. Bennie Thompson Bennie Gordon ThompsonHouse panel pans ICE detention medical care, oversight Senate to hold nomination hearing for Wolf next week Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers MORE (D-Miss.), however, charged that the unclassified nature would prevent officials from going into enough detail about efforts to protect U.S. voting systems.

“House Republicans have treated election security as a third rung issue for over a year, it is time for them to finally take this national security issue seriously,” Thompson said. “The next federal election is less than six months away.”

Pelosi, meanwhile, wrote a letter to Ryan on Tuesday urging him to make it classified to “address the seriousness of the attack on our democracy.”

The briefing is expected to be rescheduled as early as next week.

Mike Lillis contributed.