Idiot, incompetent and liar are the words most commonly associated with Donald Trump in the minds of American voters, according to a new poll.

The survey conducted by Quinnipiac University, also found that just 36 per cent of American voters approve of the US leader, a near-record low for Presidential approval ratings.

In contrast, 56 percent of voters actively disapprove of Mr Trump’s presidency and 61 per cent thought he was dishonest.

The last poll conducted by Quinnipiac in mid-April saw a bump in the President’s approval rating, following his decision to launch a missile strike in Syria, but the numbers have since flagged again.

"There is no way to spin or sugarcoat these sagging numbers," said Tim Molloy, the assistant director of the Quinnipiac Poll, which found that the President is also losing support among some of his supporter base, including white voters with no college degree, where his approval rating dropped ten points in a month, to 47 per cent.

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Among those polled, 54 per cent said they want the Democratic Party to win back control of the House in the 2018 midterm elections, compared to 38 percent who feel the opposite.

The poll was conducted just before Mr Trump fired FBI director James Comey, so approval ratings may have dipped even lower in recent days.

The President was heavily criticised for sacking the man who was leading an investigation into alleged links between Russia and his presidential campaign team as well as Russian hacking in the lead up to the election.

Democrat senators claim Mr Trump has triggered a “constitutional crisis”.

“Any attempt to stop or undermine this FBI investigation would raise grave constitutional issues,” said the Senate Democratic Whip, Dick Durbin. “We await clarification by the White House as soon as possible as to whether this investigation will continue.”