DAVENPORT, Iowa — A former paid organizer for Donald J. Trump who was fired this month has accused his presidential campaign of sex discrimination.

Elizabeth Mae Davidson, 26, who was the Trump campaign’s field organizer here in Davenport, Iowa’s third-largest city, said in a discrimination complaint that men doing the same jobs were paid more and were allowed to plan and speak at rallies, while her requests to do so were ignored. She also said that when she and a young female volunteer met Mr. Trump at a rally last summer, he told them, “You guys could do a lot of damage,” referring to their looks.

The complaint was filed on Thursday with the Davenport Civil Rights Commission.

In a telephone interview on Sunday, Mr. Trump denied making the remark but did not address the other two allegations.

“That is not the worst thing that could be said,” Mr. Trump said. “But I never said it. It’s not in my vocabulary.”