Gov. Ron DeSantis of Florida is expected to suspend his campaign for president imminently, two people familiar with the matter said Sunday.

His decision, expected to be made public before the New Hampshire primary election on Tuesday, marks a spectacular implosion for a candidate once seen as having the best chance to dethrone Donald J. Trump as the Republican Party’s nominee in 2024. Last Monday, Mr. DeSantis suffered a devastating 30-percentage-point loss to Mr. Trump in the Iowa caucuses, leaving him without an obvious pathway to the nomination.

Mr. DeSantis flew home to Tallahassee late Saturday after campaigning in South Carolina. He had been expected to appear at a campaign event in New Hampshire on Sunday afternoon, but one person familiar with the matter said that was no longer the case.

This is a developing story. This article will be updated.