Support for Florida Gov. Ron DeSantis becoming the Republican Party’s presidential nominee is waning, according to a new poll.Approval for Mr. DeSantis slipped by 5 percentage points compared to former President Donald Trump in the latest Harvard CAPS/Harris Poll released exclusively to The Hill on Friday. Mr. DeSantis now trails Mr. Trump — 23% to 46%. He previously trailed Mr. Trump by 20 percentage points in January’s poll.Mr. Trump also comes out on top in a hypothetical head-to-head matchup with Mr. DeSantis, 56% to 44%, according to the latest poll.Another sign that Mr. DeSantis is losing ground with voters emerges...