Shorten bite at Trump misplaced: Bishop

Bill Shorten's description of Donald Trump as being "barking mad" shows the Labor leader is unfit for office, Foreign Minister Julie Bishop has told parliament.

Ms Bishop on Thursday said the alternative prime minister had a responsibility not to damage or undermine the Australia-US relationship.

"He once more showed his flawed judgment and his reckless immaturity ... he is not fit to lead this country," Ms Bishop said.