WASHINGTON — President Trump on Saturday night took his post-impeachment message of grievance and political warfare directly to the religious right, telling a group of social conservatives that Democrats were trying to undo the results of the 2016 campaign and “stop our movement and impose their agenda by any means necessary.”

For the third consecutive night, Mr. Trump delivered a version of his combative response to the formal beginning of an impeachment inquiry declared last month by Speaker Nancy Pelosi, this time during an official presidential speech at the Values Voter Summit, an annual gathering of social conservatives in Washington.

“I think she hates our country,” Mr. Trump said of Ms. Pelosi. “If she didn’t hate our country, she wouldn’t be doing this to our country. It’s a fraud.” After months of restraint, Ms. Pelosi last month charged Mr. Trump with betraying the nation’s security by seeking to enlist a foreign government to damage a political rival for his own gain.

Mr. Trump’s remarks came after two nights of raucous campaign rallies, one in the progressive city of Minneapolis, and another in the deep-red district of Lake Charles, La. But at an official White House event on Saturday night, Mr. Trump delivered an almost indistinguishable message from behind a podium with a presidential seal.