House Speaker Paul RyanPaul Davis RyanSaagar Enjeti: Crenshaw's conservatism will doom future of GOP Retirees should say 'no thanks' to Romney's Social Security plan California Governor Newsom and family dress as 2020 Democrats for Halloween 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 ObamaThe Memo: Centrists change tone of Democratic race Political purity tests are for losers Deportations lower under Trump administration than Obama: report MORE, and [House Minority Leader] Nancy Pelosi, and [former Senate Democratic Leader] Harry ReidHarry Mason ReidHarry Reid: Early voting states Iowa, New Hampshire 'not representative of the country anymore' The Memo: Democrats confront prospect of long primary Bottom Line 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 Paul Democratic debate at Tyler Perry's could miss the mark with black voters RNC says ex-Trump ambassador nominee's efforts 'to link future contributions to an official action' were 'inappropriate' GOP divided over impeachment trial strategy 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 CruzOvernight Defense — Presented by Boeing — Stopgap spending bill includes military pay raise | Schumer presses Pentagon to protect impeachment witnesses | US ends civil-nuclear waiver in Iran Cruz, Graham and Cheney call on Trump to end all nuclear waivers for Iran Pompeo: US ending sanctions waiver for site where Iran resumed uranium enrichment MORE (R-Texas) called the House plan a “beginning” but also suggested it wouldn’t pass the Senate.

Sen. Susan CollinsSusan Margaret CollinsFeehery: Pivoting to infrastructure could help heal post-impeachment wounds Progressive group to spend as much as M to turn out young voters Overnight Defense: Erdoğan gets earful from GOP senators | Amazon to challenge Pentagon cloud contract decision in court | Lawmakers under pressure to pass benefits fix for military families 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 CottonGOP senator introduces bill to limit flow of US data to China Tom Cotton's only Democratic rival quits race in Arkansas Schumer concerned by Army's use of TikTok, other Chinese social media platforms 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.”