Staff separated journalists from the candidate during a July Fourth parade in New Hampshire.
“I don’t think he represents the Republican Party," Bush said.
Trump said he is the only 2016 hopeful speaking out on immigration and border security.
"I think he made a severe error in saying what he did about Mexican-Americans," Romney said.
Mitt and Ann Romney will head to Kennebunkport, Me., for lunch with Jeb next week.
"I’m hoping that he will get the nomination," said Dudley Dudley.
"At least he’s saying what Hillary will not say, but they’re both socialists," he said.
Former candidate says Trump "can't create jobs and he should know that."
New Jersey Gov. Chris Christie and Sen. Marco Rubio (R-Fla.) will meet with 2012 Republican presidential nominee Mitt Romney during Fourth of July swings through New Hampshire.
Christie, Perry and Pataki have all criticized the business mogul.