House Democrats on Wednesday released emails in which Jeffrey Epstein wrote that President Trump had “spent hours at my house” with one of Mr. Epstein’s victims, among other messages that suggested that the convicted sex offender believed Mr. Trump knew more about his abuse than he has acknowledged. Mr. Trump has emphatically denied any involvement in or knowledge of Mr. Epstein’s sex-trafficking operation. He has said that he and Mr. Epstein, the disgraced financier who died by suicide in federal prison in 2019, were once friendly but had a falling out.