Hardline Brexiteer Boris Johnson was announced as Britain’s new prime minister on Tuesday.

The New York-born politician and President Trump favorite won a landslide victory against rival Jeremy Hunt to be his party’s pick to replace Theresa May as leader — and to finally lead the UK through Brexit.

Johnson, 55, the clear favorite, addressed his party soon after the announcement, thanking them for “the extraordinary honor and privilege that you’ve just conferred on me.”

“I know that there will people around the place who will question the wisdom of your choice,” he said, raising a laugh.

He now has just 100 days to deliver on his promise to take Britain out of the EU on Oct. 31 and declared it the “most daunting” job of any British leader.

“We know that we can do it, and that the people of this country are trusting in us to do it — and we know that we will do it.”

He showed off some of his quirky humor as he also noted that “some wag” pointed out his campaign promise to “deliver, unite and defeat” spells “dud,” telling his party that they missed the “e” for energize.

“I say to all the doubters, ‘Dude, we are going to energize the country!'” he said to more laughter.

He praised his opponent Hunt, telling him, “You’ve been a font of excellent ideas, all of which I’m going to steal forthwith.”

He also paid tribute to May’s “extraordinary service to this party and this country.”

Trump sent his congratulations, predicting of Johnson: “He will be great!”

May held her last cabinet meeting Tuesday morning and was given a handbag as a farewell present, according to The Sun.

She will take her final Prime Minister’s Questions tomorrow — then make a short speech outside No. 10 Downing Street before going to Buckingham Palace and handing her resignation to the Queen.

Johnson will follow her to the palace shortly afterward and is likely to address the nation in Downing Street as he starts his work, the paper said.