California Rep. Devin Nunes said House Republicans have subpoenas “ready to go” if they win control of the House in November.

Nunes, the ranking member of the House Intelligence Committee, issued a warning to Justice Department and FBI officials involved in the Russia investigation during an interview with Fox News on Friday at the Conservative Political Action Conference in National Harbor, Maryland.

“You can be sure of this, if we take the House in November, we have subpoenas ready to go that will continue going after these dirty cops,” the Republican congressman said.

It’s a tall order for the GOP to regain control of the lower chamber. Republicans need a net gain of 18 seats to win back the House. Most committees and subcommittees delegate the power to authorize subpoenas to the panel chairman or chairwoman.

Nunes, a key Trump ally who was instrumental in drawing attention to alleged government surveillance abuses against the president’s 2016 campaign and leakers, criticized the Democrats for not taking serious action to make “reforms” in the Foreign Intelligence Surveillance Act process.

“What they’re trying to do is a cover-up — they’re trying to cover up the fact that their party was involved in the biggest political scandal in modern U.S. history, where they fed disinformation, likely Russian disinformation from a campaign into the FBI and opened an investigation on the other campaign,” Nunes said.

Congress is now considering a reauthorization of key parts of the FISA law, with an expiration date coming up this month.