Both Mr. DeSantis and Mr. Scott will be at the July 4 parade in Merrimack, N.H., as will several other Republican presidential hopefuls: Mr. Burgum, former Representative Will Hurd of Texas, the entrepreneur and author Vivek Ramaswamy, and Perry Johnson, a Michigan businessman. Mr. Trump’s campaign evinces no concern that his absence from the stage will give his rivals any room to make up ground in the Republican primaries. Republican veterans don’t see much of an opening for Mr. Trump’s rivals either. “He definitely plays by a different set of rules,” said David Kochel, a longtime Republican adviser and strategist in Iowa. field at the Republican Party of Iowa’s biggest fund-raiser, the Lincoln Dinner, on July 28.

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