Boris Johnson becomes prime minister after winning a party leadership contest to succeed Theresa May.
"As the law currently stands, the United Kingdom leaves the European Union on October 31st come what may but the exciting thing for us now is to get a good deal" Johnson said while speaking to reporters in NY.
The ruling paves the way for legislators to return to parliament, where Johnson has no majority.
"It means in practice, prorogations can only happen for a few days but can't be used in this way to limit the way the parliament holds the government to account. On the back of this, Boris Johnson must resign".
The top court's decision will be announced at 10:30 a.m. (0930 GMT), but some analysts say it is unlikely to move sterling by much, since the implications are more of a long-term issue.
The 11 justices at the Supreme Court in London will rule on appeals from two separate challenges brought in England and Scotland over the suspension - formally known as prorogation - of Parliament.
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Tempers have been inflamed in Parliament as the October 31 Brexit deadline gets closer.
She said the decision to suspend Parliament was based on the legal advice at the time, which said it could be done lawfully.
The US President said Mr Johnson remains the politician able to "get it done" over Brexit.
It came at the end of a turbulent period for Johnson, who has lost multiple votes in Parliament since becoming prime minister in July and suffered a series of resignations from his government, including that of his brother.
He flew home early after Britain's Supreme Court unanimously ruled 11-0 on Tuesday that his attempt to suspend Parliament for five weeks had the effect of stymieing its scrutiny of the government over Brexit.
Even Brexit Party leader Nigel Farage, a borderline ally of Johnson's, said the Conservative government was "in trouble" and that "as a matter of honor", Johnson should offer to resign immediately.
"The decision to advise Her Majesty to prorogue Parliament was unlawful because it had the effect of frustrating or preventing the ability of Parliament to carry out its constitutional functions without reasonable justification", she said.
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Asked if he had any advice for Boris to deal with the Supreme Court judges, Mr Trump said: "No I think he's doing very well".
He accused MPs of "sabotaging" Brexit and threw down the gauntlet to the opposition parties, challenging them to table a vote of no-confidence or agree to a general election and face "a day of reckoning with the voters".
While Mr Cruddas wished the then-new prime minister well, he denounced the system that saw him elected.
The judgement has hit Johnson's authority, prompting calls for his resignation and cast further doubt on his promise to pull Britain out of the European Union on October 31, come what may.
Johnson has repeatedly said he can strike an exit deal with the EU's 27 other members at a summit on October 17-18.
Corbyn joined others in calling for Johnson to resign.
His lawyer Lord Garnier QC said the former prime minister is of the view the "inference was inescapable" that Mr Johnson's decision was "motivated by his political interest in ensuring that there was no activity in Parliament during the period leading up to the EU Council summit on October 17 and 18".
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