Huckabee sparked outrage for invoking the Holocaust in his criticism of the deal.
Carson also discussed illegal immigration in an NBC interview.
“I think that the email scandal is going to be a devastating blow,” Trump said.
Priebus said it's not unreasonable to say that Republican candidates ought to support GOP.
“Everyone is going to have an opportunity,” Priebus said. “I think it’s great.”
Sanders said he was surprised by Clinton's reluctance to state a position on Keystone XL.
"Donald Trump, like every other candidate, will rise and fall,” said Santorum.
Paul had chalked up Trump's support to a "temporary loss of sanity."
"I think most Americans don't want their tax dollars going to this," he said.
Jonathan Easley 08/02/15 10:30 AM EDT
Ohio Gov. John Kasich entered the GOP race late but has already made inroads.