Since announcing his campaign in November, Mr. Trump has spent much of the past two months out of the public eye. “The campaign is firing on all cylinders and continues to build up an operation that will be unmatched,” Steven Cheung, Mr. Trump’s campaign spokesman, said in a statement. Mr. Trump was stunned by the criticism over the dinner, particularly that from close advisers, according to people familiar with the conversations. Ms. Haley, who served as ambassador to the United Nations in the Trump administration, is weighing her own Republican presidential campaign. Mr. Renacci listed several reasons he wasn’t ready to support Mr. Trump’s presidential bid.