By Stephen Collinson, Dana Bash, Phil Mattingly, Deirdre Walsh, Lauren Fox and MJ Lee

CNN

WASHINGTON (CNN) -- House Speaker Paul Ryan sensationally pulled his Obamacare repeal bill from the floor on Friday, a day after President Donald Trump had threatened to walk away from health care reform if he didn't get a vote.

After a dramatic day on Capitol Hill, Ryan rushed from the White House to Capitol Hill to tell Trump he did not have the votes to pass the measure, the culmination of seven years of Republican efforts to eradicate President Barack Obama's proudest domestic achievement.

Two senior administration officials said the decision to pull the bill was Ryan's.

The decision means that for now, at least, Obamacare will remain in place until Republicans can come up with some plan that can overcome deep intra-party divisions about how to kill it.

The decision to delay the vote marks an acute embarrassment for Trump, who had gambled big by presenting holdout House conservatives with a take-it-or-leave it ultimatum on Thursday night and put his own credibility on the line.

It also puts Ryan in a much weakened political position, after being defied by his own conference, which seems just as unsuited to governing in the Trump era as it was when it was effectively a protest coalition under Obama.

Before the vote was canceled, White House press secretary Sean Spicer said Friday afternoon that Trump has "left everything on the field when it comes to this bill."

But Republicans had few firm commitments from conservatives and watched a continued exodus of moderates. This was exactly what House leadership was worried would happen when they changed the bill, the source said.

Friday afternoon, moderate Republicans and members of the conservative Freedom Caucus have indicated they won't back the bill.

Blame game

The decision to pull the bill puts into question the state of Trump and Ryan's relationship.

Trump has confidence in Ryan, Spicer said earlier Friday.

"I think the speaker has done everything he can," Spicer said. "He's worked really closely with the President. I think at the end of the day, you know I said this yesterday, you can't force people to vote."

But the President is said to be "agitated" by the process, an aide said, which he thinks is all "political."

There have been whispers against Ryan, suggesting that if the bill fails it will inflict a series blow to the relationship between the speaker and the President which will be vital to moving forward the Republican agenda.

State of play

The vote was already delayed a day to give Republican leaders a chance to eke out a majority for the bill, is currently scheduled to proceed following Trump's huge gamble in warning he would walk away from health care reform if the GOP did not follow his desires.

Spicer told reporters "you guys are so negative" as they asked about the poor prospects for the vote.

Trump started calling lawmakers early in the morning, Spicer said. "The President and his team have committed everything they can to making it happen."

Ryan needed to get a simple majority in the House -- around 216 votes depending on how many members show up to vote. He can probably afford to lose no more than 21 Republican votes.

Freedom Caucus holding out?

Vice President Mike Pence met with members of the House Freedom Caucus at the Capitol Hill Club, a source familiar with the meeting says.

Freedom Caucus members stood by their ideological objections to a bill they say does not go far enough in repealing Obamacare.

There are signs of frustration in the White House at the Freedom Caucus, which has won a series of concession but is still holding out against the bill.

"We've emboldened them," one White House aide said.

Freedom Caucus Chairman Mark Meadows, R-North Carolina, was mum about his plans. "I'm not making any comment," he said.

A Republican official involved in counting votes says the party thinks it needs about 25 of the roughly 36 members of the conservative House Freedom Caucus members to back the GOP health care bill if it's going to pass Friday.

But while Mark Meadows claims lawmakers are allowed to vote their conscience, White House and GOP leadership don't think the Freedom Caucus members take that seriously.

The Freedom Caucus traditionally votes in a block and it will be hard to break from that.

Will moderates flee?

Rep. Leonard Lance, R-New Jersey, said that without a doubt, the decision to concede the repeal of essential health benefits to the Freedom Caucus definitely moved some of his colleagues to "no."

"I suspect some became a no because of that," Lance said. "That certainly didn't help."

The northeast Republicans are the ones to watch, he said.

"New York, New Jersey, Pennsylvania -- that's where you should count heads."

What's in the bill

The GOP health care bill would eliminate many of the taxes and eradicate the individual mandate imposed by Obamacare, officially known as the Affordable Care Act. Instead of the Obamacare subsidies that are tied to income and premiums, the GOP plan provides Americans with refundable tax credits based mainly on age to purchase health insurance.

The bill also significantly curtails federal support for Medicaid and allows states to require able-bodied adults to work. After 2020, states that expanded Medicaid would no longer receive enhanced federal funding to cover low-income adults like they did under Obamacare, and states that haven't expanded would be immediately barred from doing so.

However, the GOP bill doesn't touch some of the most popular pieces of Obamacare, including letting children stay on their parents' insurance plans until the age of 26 and including protections for people with pre-existing conditions. But it would end the requirement that insurers offer comprehensive policies that cover maternity, drugs, mental health and substance abuse.

CNN's Jeremy Diamond, Jeff Zeleny and Tami Luhby contributed to this story.