President Donald Trump's job approval rating dipped to 39 per cent in the latest Gallup survey, rolling back gains since the government shutdown.

Pollsters took the survey immediately after Trump's North Korea summit in Hanoi, where he failed to reach an agreement with dictator Kim Jong Un despite planning for a signing ceremony. Trump said afterwards that sometimes you need to 'walk away.'

It also follows a weaker than expected jobs report, with just 20,000 U.S. jobs were created in February – the worst report since September 2017.

Also dominating the headlines during the period were Trump's repeated attacks on investigators and on his former longtime lawyer Michael Cohen following Cohen's bombshell congressional testimony.

President Donald Trump's approval rating ticked down to 39 per cent in the latest Gallup survey

Among other things, Cohen produced checks Trump wrote him in $35,000 increments that were reimbursement for the $130,000 payment Cohen gave porn star Stormy Daniels, who claims she had an affair with Trump.

During questioning, Cohen said Trump directed the criminal scheme, which has him going to jail in May. Republicans on the committee trashed Cohen as a liar but did not muster a defense of Trump's hush payments that went to the porn star.

Trump has repeatedly branded Cohen a liar and called the Mueller probe a 'witch hunt.'

The drop came amid a weaker than expected jobs report, a summit in Hanoi that resulted in no agreement, and Michael Cohen's testimony in Congress

Michael Cohen implicated Trump in a campaign finance crime during his testimony

The March survey period featured new revelations about the payments to porn star Stormy Daniels

Trump's average approval rating is the lowest for any president since Harry Truman, according to Gallup, and was one structural factor in Democratic House gains in November.

Trump has only hit 45 per cent twice in his presidency, once immediately after taking office and once after his initial summit with Kim, which resulted in a joint statement critics later cast as vague. He had an up-tick to 44 per cent in February, after the government reopened and with some robust job reports. Unemployment stands at 3.9 per cent as a field of Democrats seeking to unseat Trump takes shape.