President Donald Trump played down suggestions that UK Prime Minister Boris Johnson should resign after he was found to have unlawfully suspended Parliament.

Asked how he responded to calls for him to go, Johnson told reporters at the UN General Assembly, “we respect the judiciary in our country,” before adding that he disagrees "profoundly" with the Supreme Court's ruling.

“That was a very nasty question,” Trump added when Johnson finished speaking. “I know him well, he’s not going anywhere,” the President said.

Trump also said Johnson’s difficulties are “pretty much what you expected” from the Brexit process, and added he will make great progress on Brexit come October and November -- to which Johnson quickly interjected, “October! October!”

Trump then repeated his false claim that he had predicted the result of the Brexit vote in Britain before polls closed. “I was there, I happened to be there the day of the vote ... I even made a prediction. It was a correct prediction,” Trump said. Trump had in fact been in the UK the day after the result.

The President said he had "no reaction" to the Supreme Court ruling, calling it "another day at the office for Johnson."

He then discussed his own administration's "0 for 7" start in the Supreme Court, before he got a "great streak going" with the body, suggesting the same turnaround will come for Johnson.

"We're full of respect for the justices of our Supreme Court," Johnson interrupted, prompting Trump to laugh and tap him on the shoulder. "He's being very nice to the courts," Trump said with a smile.