House Speaker Paul RyanPaul Davis RyanTrump quietly rolled back programs to detect, combat weapons of mass destruction: report Ocasio-Cortez top aide emerges as lightning rod amid Democratic feud Juan Williams: GOP in a panic over Mueller MORE (R-Wis.) said the problems facing GOP leaders' plans to repeal and replace ObamaCare are part of natural "growing pains" after retaking the White House. 

“We are going through typical growing pains from being an opposition party fighting Barack ObamaBarack Hussein ObamaMichelle Obama weighs in on Trump, 'Squad' feud: 'Not my America or your America. It's our America' Media cried wolf: Calling every Republican a racist lost its bite Rubio criticizes reporters, Democrat for racism accusations against McCain MORE, and [House Minority Leader] Nancy Pelosi, and [former Senate Democratic Leader] Harry ReidHarry Mason ReidDems open to killing filibuster in next Congress Webb: Questions for Robert Mueller Steyer's impeachment solution is dead wrong MORE to a governing party,” Ryan said during an interview with Fox News' Tucker Carlson.  

"And now we're translating that legislation, that plan into a bill."

Ryan has faced opposition from conservatives within the GOP and outside groups who are unhappy with the new healthcare plan and say leadership likely won't get the votes needed.

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Sen. Rand PaulRandal (Rand) Howard PaulUS-Saudi Arabia policy needs a dose of 'realpolitik' McConnell challenger faces tougher path after rocky launch Overnight Defense: Iran seizes British tanker in latest escalation | US, UK to discuss situation | Trump says 'no doubt' US downed Iranian drone after Tehran's denials | Pentagon's No. 2 policy official to leave | Lawmakers worry about Defense vacancies MORE (R-Ky.) snubbed the House bill as “ObamaCare lite” on Wednesday, claiming it will be “dead on arrival” in the Senate. He said he was working with Freedom Caucus members to produce a better repeal alternative that more closely aligns with the legislation conservatives supported in 2015. 

Sen. Ted CruzRafael (Ted) Edward CruzHow to reduce Europe's dependence on Russian energy Cruz calls for 'every penny' of El Chapo's criminal enterprise to be used for Trump's wall after sentencing Conservatives defend Chris Pratt for wearing 'Don't Tread On Me' T-shirt MORE (R-Texas) called the House plan a “beginning” but also suggested it wouldn’t pass the Senate.

Sen. Susan CollinsSusan Margaret CollinsPoll: McConnell is most unpopular senator Hillicon Valley: Lawmakers struggle to understand Facebook's Libra project | EU hits Amazon with antitrust probe | New cybersecurity concerns over census | Robocall, election security bills head to House floor | Privacy questions over FaceApp Trump angry more Republicans haven't defended his tweets: report MORE (R-Maine) said she is “not crazy” about proposal. 

Other Republicans expressed caution, saying the ObamaCare repeal and replace is moving too quickly. 

“I think we’re moving a little bit too quickly on healthcare reform,” Sen. Tom CottonThomas (Tom) Bryant CottonLawmakers introduce bill to block U.S. companies from doing business with Huawei Five things to know about Iran's breaches of the nuclear deal Hillicon Valley: Trump gets pushback after reversing course on Huawei | China installing surveillance apps on visitors' phones | Internet provider Cloudflare suffers outage | Consumer groups look to stop Facebook cryptocurrency MORE (R-Ark.) told MSNBC’s “Morning Joe.” “This is a big issue.”

And Freedom Caucus members in the House have voiced their opposition to some of the proposals, especially tax credits.

Despite the criticism, House leadership is pushing forward. 

Ryan told Carlson it's impossible to get everything Republicans want into a bill, particularly under a special budgetary process known as "reconciliation" that allows legislation to pass with a simple majority.

"A lot of outside groups and folks just don’t understand the fact that if we put everything in the bill we possibly we want, we would have a filibuster, we wouldn't be able to pass it in the Senate. So this bill, which is the first phase of a three-phase plan, is what we can pass without a filibuster in budget bill."

When Carlson said that members of Congress would understand the requirements of a reconciliation bill, Ryan responded: “We're finding that some don’t.”