Brexit Party leader Nigel Farage | Christopher Furlong via Getty Images Nigel Farage says he will not fight a seat in UK election Brexit Party leader says he wants to spread his message across the country.

Brexit Party leader Nigel Farage will not contest a seat in the U.K.’s general election on December 12.

Farage told the BBC’s "The Andrew Marr Show" that not being tied to a constituency would mean he could campaign more effectively for the Brexit Party around the country.

On Friday, U.K. Prime Minister Boris Johnson rejected Farage’s call to form a “Leave alliance” between the two parties to prevent them from splitting the Brexit vote in constituencies where other parties who back Remaining in the EU could come through the middle. "I still hope and pray it happens [a Leave alliance], but it doesn't look like it will," he said.

In the absence of a pact with the Tories, Farage said his party would challenge every seat in England, Scotland and Wales.

When asked about his personal decision of whether to stand he said: “I've thought very hard about this. How do I serve the cause of Brexit best ... Do I fight a seat? Try to get myself into parliament or do I serve the cause better traversing the length and breadth of the United Kingdom supporting 600 candidates.

“I've decided the latter course is the right one,” he added.

Farage plans to travel across the U.K. to tell the public that Johnson’s divorce deal with the EU does not represent a genuine Brexit.

"I did not spend 25 years campaigning to leave the EU treaty to sign up to another one. And that is what this [deal] does," he added, calling Johnson's accord with the EU a "Remainer's Brexit."

“This doesn't get Brexit done, I think this kills off the chance of genuine independence," he said.