(Updated with Tancredo comments)
(CNN) – Conservative firebrand Tom Tancredo will run for governor of Colorado despite strident objections from the state GOP, the former congressman is set to announce later Monday.
Tancredo floated the possibility of a third-party gubernatorial run last week, demanding that the two-current GOP candidates who have both been beset by scandals withdraw from the race after the August 10 primary if polls show Democrat John Hickenlooper far ahead.
The Republicans - Scott McInnis and Dan Maes - both scoffed at Tancredo's threat, prompting the onetime Republican presidential candidate to step up his announcement.
"I will officially announce at noon that I will seek the nomination of the constitution party," Tancredo told The Denver Post.
The move gave rise to a heated exchange between Tancredo and Colorado GOP chairman Dick Wadhams on local radio station KHOW Monday, with the two men descending into a shouting match over what is best for the Colorado Republican party.
"Why don't you wait until after the primary?" Wadhams implored Tancredo.
"Because you know as well as I do, if I am going to run, I have to get going," responded Tancredo. "There is no downside for either one of these guys to simply say 'If I am not ahead at that time I will get out.'"
"What will your agenda be?" Wadhams also asked Tancredo sarcastically. "Are you going to keep talking about impeaching Obama and bombing Mecca?
McInnis, a prominent Colorado lawyer apologized earlier this month for plagiarizing several passages of a judge's work in producing a series of essays for which he was paid $300,000 to write as part of a fellowship in 2003. Maes, meanwhile, is facing political troubles too, agreeing earlier this month to pay more than $17,000 in a fine for campaign finance violations.