Mick Mulvaney went to the mattresses on the debt ceiling two months ago. He just lost.

President Trump's fiscally conservative budget director didn't just admit defeat. Mulvaney endorsed the very idea he'd been fighting against for months.

Talking to reporters during a Thursday briefing, Mulvaney insisted that the White House wants both a clean debt ceiling hike and a clean continuing resolution this year. There's no administration "infighting" over whether to include spending cuts, he said, at once downing the dreams of a thousand deficit hawks.

"It's disappointing," a conservative House member texted when he heard the news. The disappointment is understandable. After all, Mulvaney was supposed to be their guy on the inside, the budget guy balancing the books for once.

"As OMB dirctor and a member of the president's cabinet, I understand Mulvaney's role in being a team player," Rep. Mark Walker, R-N.C., told the Washington Examiner after the news broke. But sympathy for his beleagured former colleague didn't stop Walker from slamming the administration for "using Washington-speak" to justify "the status quo that has left us with a $20 trillion hole in the bank."

"Republicans control the White House and both sides of Congress," Walker continued. "We need to start passing legislation that reflects that."

And for a while it looked like that might happen. Mulvaney first squared off against Treasury Secretary Mnuchin, telling the Washington Examiner in May he'd "like to see things attached to it that drive certain spending reforms and debt reforms in the future."

Back then, Mulvaney compared the debt ceiling to a "smoke alarm." When the ceiling is reached, he said, "it's a warning that we've now, once again, spent more than we have. It has traditionally been used to step back and try and maybe assess why we are spending more than we have, and what are we are going to do about it."

But as that alarm blares, Mulvaney appears to be plugging his ears. Already, according to Politico, Republican leadership plans to raise the $19.8 trillion debt limit with no strings attached.

Practically speaking, that means Speaker of the House Paul Ryan and Senate Majority Leader Mitch McConnell will need Democrat votes to avoid default. A quick survey of conservatives shows why. Sen. James Lankford, R-Okla., has already drawn a line in the sand against any increase and members of the House Freedom Caucus have said they'll support a debt increase in exchange for cuts to mandatory spending.

Without an administration ally, conservative resistance likely won't stand a chance. Even with the budget director in their corner, it's hard to imagine the White House pressing pause on their legislative agenda to fight Congress over spending.

Maybe Mulvaney is less of a budget hawk and more of a canary in the fiscal coal mine. He's fine staking out contrarian opinions before getting on board in the end.

Philip Wegmann is a commentary writer for the Washington Examiner.