Rep. Mo Brooks of the hard-line Freedom Caucus told CNBC on Friday the House Obamacare replacement plan is the worst bill he's seen in 30 years of public service.
"It's not a repeal. It's a marketing ploy," he said.
Brooks is calling for a straight repeal of former President Barack Obama's 2010 health-care law, despite the long odds of ever getting the Senate to go that far.
"We can either go bankrupt as a country or do the right thing," he said.
Meanwhile, White House budget director Mick Mulvaney told CNBC in a later interview the ultimatum he delivered from the president was to all House Republicans.
No one group, such as the Freedom Caucus, was being singled out, said Mulvaney, who had been a member of that conservative group when he was a congressman from South Carolina.
Mulvaney said he's not sure whether Republicans have enough votes for passage but stressed "the president has his offer on the table."
Brook said he won't be swayed by the White House or his fellow House Republicans.