The Morning Consult/Politico survey of 1,994 registered voters found 73 percent of Republicans would back Trump in a hypothetical head-to-head primary, compared with just 9 percent who said they would vote for Hogan. The deficit was mirrored in hypothetical matchups with two other potential Republican contenders, former Govs. John Kasich of Ohio and Bill Weld of Massachusetts, who is formally exploring a bid.

As recently as last week, Hogan publicly shrugged off talk of an intraparty challenge to Trump — who, despite his unpopularity among the electorate overall, retained the approval of 83 percent of GOP voters in the March 22-24 poll, which has a margin of error of 4 percentage points among Republicans.