A dark horse candidate who is qualified for the job of White House press secretary is Christina Pushaw, the spokesperson for Florida Gov. Ron DeSantis, who also worked on his presidential campaign. Pushaw is a prolific social media attack dog on behalf of conservative causes, whose tweets of late have been conspicuously pro-Trump.

Ms. Wiles, a principal architect of Donald J. Trump’s 2024 presidential campaign, will become the first woman to hold the job.