Donald Trump says the perpetrators of the Manchester arena attack are "evil losers".

Speaking on Tuesday morning after a meeting in Bethlehem with Palestinian Authority President Mahmoud Abbas, the US President said he would not call terrorists "monsters".

Standing alongside Abbas, Trump said an agreement with Israel could "begin a process of peace all throughout the Middle East."

"My thought are with the people of Manchester after this terrible terrorist attack. They were evil losers," he said.