The action on ObamaCare repeal and replacement now turns to the Senate.

House Republicans and President Trump on Thursday celebrated the House passing their repeal bill after a long fight that divided the caucus.

But the bill faces an even tougher path in the upper chamber.

The Senate is indicating that it will take some time on the process, and write its own version of the legislation, dismissing the House blueprint.

"There is no timeline," said Sen. John Cornyn John CornynSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Republican Senators raise concerns over Oracle-TikTok deal MORE (Texas), the Senate's No. 2 Republican.

Sen. Lamar Alexander Andrew (Lamar) Lamar AlexanderTrump health officials grilled over reports of politics in COVID-19 response Now is the time to renew our focus on students and their futures CDC says asymptomatic people don't need testing, draws criticism from experts MORE (R-Tenn.), chairman of the Senate health committee, added that the upper chamber will write its own bill.

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"The Senate will now finish work on our bill, but will take the time to get it right," Alexander said in a statement.

Senators have set up a working group to write the bill. But they stressed that they intend to take the time to get input, including an analysis from the Congressional Budget Office.

There are also thorny disagreements within the conference over issues like ObamaCare's expansion of Medicaid.

Several Republican senators from states that accepted the expansion are wary of ending it in 2020, as the House bill does, and could propose a more gradual transition.

"I've already made clear that I don't support the House bill as currently constructed because I continue to have concerns that this bill does not do enough to protect Ohio's Medicaid expansion population, especially those who are receiving treatment for heroin and prescription drug abuse," Sen. Rob Portman Robert (Rob) Jones PortmanRomney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery House passes B bill to boost Postal Service MORE (R-Ohio) said in a statement.

"We can't be for half a dozen different proposals; we have to be for a proposal for us to get 51 votes in the Senate," Cornyn said.

"We'll start with the House bill, but we'll need to work with every member of the Senate conference to see what they need to get to yes," he added.

The Senate could also act to increase the financial assistance in the tax credits in the bill so that older and lower income people get more help.

Sen. John Thune John Randolph ThunePowell warns failure to reach COVID-19 deal could 'scar and damage' economy Senate Republicans signal openness to working with Biden Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (R-S.D.) has proposed such a change, and Freedom Caucus Chairman Rep. Mark Meadows (R-N.C.) said he was working with the Senate on that idea.

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