Texas Senator Ted Cruz was booed as he failed to endorse Donald Trump as the US Republican nominee, during a speech at the party convention in Cleveland.
Mr Cruz only went as far as congratulating the man who had been his bitter rival in the primary contests.
Angry chants of “We want Trump!” and “Endorse Trump!” grew louder as the senator came to the end of his speech.
Indiana Governor Mike Pence then took centre stage to give his vice-presidential acceptance speech.
Mr Pence praised Mr Trump’s record as a businessman and said the country had “but one choice” in November.
“It’s change versus the status quo, and when Donald Trump is president, the change will be huge,”
But Mr Cruz is likely to steal the headlines after stoking the rage of the convention, to such an extent that his wife Heidi had to be escorted from the floor.