he former UKIP leader will tell the Conservative Political Action Conference in Maryland the US President has exceeded all expectations since taking office by delivering on his campaign promises.
Mr Farage will be accompanied by Arron Banks, the ex-UKIP donor and his ally Andy Wigmore – who together posed by a gold lift with Mr Trump in a now infamous post-election photo.
The group, whose role in the EU referendum campaign was captured in the book The Bad Boys of Brexit, will be the most prominent Britons at the annual conservative gathering.
They will meet Republican governors and right-wing campaigners during the three-day event and Mr Farage is scheduled to speak on Friday.
Mr Farage said: “I shall say here’s a man who is keeping faith with his electorate.
“Here is a man who is achieving extraordinary things and here is a guy who has exceeded even the most optimistic expectations of what he would be capable of as US president.”
Mr Farage’s support of Mr Trump during his election campaign saw him praised by the billionaire property tycoon.
He was put forward by Mr Trump as a possible British ambassador after the election victory and has since been given a regular slot on Fox News in the US.
Mr Farage will insist in his speech that Brexit was not a “one-off” and say the populist tide sweeping Europe is still on the rise.
He said he would tell delegates: “Don’t be distracted by everybody’s excitement over Emmanual Macron.
“The revolution of those that believe in nation state and national identity is still rolling.
“The vote that is called ‘populist’ in Europe averaged 8 per cent in 2000, it is now 24 per cent.
“The pivot that 2016 represents was far from being a temporary blip.”
Cpac is a fixture in the Washington political calendar, attracting thousands of conservatives from across the country for a series of keynote speeches, fringe events and book signings.
Both Mr Trump and Mike Pence, the vice president, will be giving addresses as well as US cabinet members, talk radio hosts and foreign politicians.
There has already been a row about the scheduled appearance of Marion Maréchal-Le Pen, niece of presidential candidate Ms Le Pen, whose hard-right views have offended some.