The upcoming GOP debate dominated discussions.
Carson also discussed illegal immigration in an NBC interview.
Priebus said it's not unreasonable to say that Republican candidates ought to support GOP.
Sanders said he was surprised by Clinton's reluctance to state a position on Keystone XL.
Paul had chalked up Trump's support to a "temporary loss of sanity."
"They attacked me first and I hit them back," he said Sunday.
“Most Republican voters hate their party,” Michael Needham said.
"I don’t know what Donald Trump is paying attention to," Perry says.
"We all need to take a deep breath," he said about polls.
Hillary Clinton and ISIS also shared in the Sunday morning spotlight.
"People are outraged by this," the GOP presidential candidate said.
"That never should have happened," Jindal said.
Huckabee sparked outrage for invoking the Holocaust in his criticism of the deal.
“I think that the email scandal is going to be a devastating blow,” Trump said.
“Everyone is going to have an opportunity,” Priebus said. “I think it’s great.”
"Donald Trump, like every other candidate, will rise and fall,” said Santorum.
"I think most Americans don't want their tax dollars going to this," he said.
The GOP presidential candidate also criticized President Obama's record on the Middle East.
Christie said he is still deciding what to do with 11 million illegal immigrants in the U.S.
“I have enough to do to get my message out to people,” Kasich said.
“I need my friends on the Republican side of the aisle to help us," he said.
"He is basically selling fear and prejudice," Graham said.
“I would be part of a coalition and I would take them down,” Kasich said.
Planned Parenthood President Cecile Richards called the hidden-camera footage "sensationalized."