Boris Johnson has rejected the suggestion from Nigel Farage and Donald Trump that he should work with the Brexit Party during the election, APA reports citing BBC.
The Tory leader told the BBC he is "always grateful for advice" but he would not enter into election pacts.
His comments come after the US president said Mr Farage and Mr Johnson would be "an unstoppable force".
Downing Street sources say there are no circumstances in which the Tories would work with the Brexit Party.
In an interview with BBC political editor Laura Kuenssberg, the prime minister said the "difficulty" of doing deals with "any other party" is that it "simply risks putting Jeremy Corbyn into Number 10".
"The problem with that is that his (Mr Corbyn's) plan for Brexit is basically yet more dither and delay," Mr Johnson said.