Representative Liz Cheney of Wyoming, who has broken with Mr. Trump on some foreign policy issues and praised Dr. Anthony S. Fauci, the nation’s top infectious disease expert who occasionally contradicts Mr. Trump, was not asked to speak, her aides confirmed. Some of the president’s closest congressional allies, along with his eldest son, have openly criticized Ms. Cheney this summer for not being a more steadfast supporter of Mr. Trump.
In addition to the array of women expected to appear on Wednesday, Republicans turned to some other nontraditional Republican figures in an effort to reach beyond Mr. Trump’s older and heavily white base by appealing to younger and more diverse constituencies.
Representative Lee Zeldin of New York, one of the few Jewish Republicans in Congress, spoke, as did 25-year-old Madison Cawthorn, a House candidate in North Carolina who won a surprise victory in a primary this year.
Mr. Cawthorn, who uses a wheelchair, spoke about his vision for a new town square in American life and concluded his remarks by standing with the help of a walker. “For our republic for which I stand,” Mr. Cawthorn said as he rose, “one nation under God, with liberty and justice for all.”
Richard Grenell, who served as Mr. Trump’s ambassador to Germany and was briefly the acting director of national intelligence, was also scheduled to speak.
Mr. Grenell, who was one of the most prominent openly gay people in the administration, was expected to discuss the president’s support for L.G.B.T. rights. However, Mr. Trump has been inconsistent on the issue, as has his convention: On Tuesday, a granddaughter of Billy Graham used her remarks to claim that Democrats had sought to let boys “use girls locker rooms.”
This head-snapping change in messages — often from the upbeat to the apocalyptic — has characterized Mr. Trump’s convention to date.