WASHINGTON — At an event on Thursday billed as a round-table discussion on tax overhaul, President Trump aired a litany of familiar — and often inaccurate — grievances on immigration, trade and voter fraud.

He suggested he had been vindicated by reports about the perils of immigration, particularly for women, and referred to a “caravan” of hundreds of Central American migrants traveling through Mexico, some headed toward the United States border.

“Remember my opening remarks at Trump Tower when I opened,” Mr. Trump said at the discussion, in White Sulphur Springs, W.Va., referring to comments he made in 2015 during a speech announcing his candidacy for president. “Everybody said, ‘Oh, he was so tough,’ and I used the word ‘rape.’”

Mr. Trump continued, “And yesterday, it came out where, this journey coming up, women are raped at levels that nobody has ever seen before.”