For the second time, GOP leaders postponed a scheduled bill vote after running into objections from conservatives and moderates.
Republicans will turn their focus to tax reform after getting dealt a blow in their first major policy effort.
"We came really close today, but we came up short," Ryan said.
The GOP failed to rally the support needed to pass the bill, facing pressure from both its conservative and moderate wings.
Republicans are trying to rally support for their Obamacare replacement bill ahead of a House vote.
Manafort, whose ties to Russia have drawn scrutiny, "voluntarily offered" to come to the committee, Rep. Nunes said.
Trump warns the Freedom Caucus that federal funding will still go to Planned Parenthood if the status quo is maintained.
Republicans struggled to rally enough support for the bill to repeal and replace parts of the Affordable Care Act, prompting President Donald Trump to seek a vote on Friday.
The lack of an agreement throws more doubt on a planned Thursday night vote on the crucial legislation.
Democratic Sen. Bob Casey, who faces re-election in 2018, also said he will oppose Gorsuch.