US election 2016: Donald Trump under attack from debate rivals

The front-runner in the Republican race was on the defensive in Detroit as Marco Rubio and Ted Cruz piled in.

In a testy debate, Mr Trump admitted he changed his stance on issues but said flexibility was a strength.

Senior Republicans say Mr Trump is a liability who would lose the election.

The debate hosted by Fox News began with Mr Trump being asked about an attack earlier in the day by Mitt Romney, the 2012 nominee, who accused the businessman of bullying, greed and misogyny.

Mr Trump dismissed Mr Romney as a "failed candidate", but he immediately found himself on the defensive from Mr Rubio.

The Florida senator said he was "not going to turn over the conservative movement to someone who thinks the nuclear triad is a rock band from the 1980s".

(BBC)