Donald Trump, the provocative Republican presidential candidate, has caused anger among his party members by attacking Republican grandee John McCain.
Speaking at an Iowa gathering billed as a "Family Leadership Summit", Mr Trump escalated a war of words with his Republican colleague. On Monday Mr McCain had accused Mr Trump of "firing up the crazies" with his controversial statements.
On Saturday Mr Trump hit back.
"He was a war hero because he was captured," said Mr Trump. "I like people who weren't captured."
Mr McCain, a former Navy pilot, spent over five years in a notorious North Vietnamese prison known as the Hanoi Hilton, where he was repeatedly tortured. He spent two of those years in solitary confinement.
