Trump makes me tremble: Howard

Former prime minister John Howard "trembles" at the thought of Donald Trump becoming the next US president.

But if Mr Trump becomes the Republican candidate he expects him to lose to Democrat Hillary Clinton.

"I'm conflicted by that because my natural inclination would be to see a Republican in the White House, but I tremble at the thought of Trump being president. There's an instability about him that bothers me," he told Sky News on Sunday.