Repealing Obamacare could take months and developing replacement health insurance plans could take years, senior Republican aides in the U.S. Congress said on Thursday, discouraging talk of a quick end to the program after President-elect Donald Trump takes office on Jan. 20.

“We are talking a matter of weeks, in two months – but not a matter of many months” for Congress to pass a repeal, one aide said, adding that Republicans “certainly” hope Trump will sign the repeal into law in the first half of 2017.

Congressional Republicans are consulting with the Trump transition team on when the effective date of the repeal should be, another aide said. Setting it a few years out will provide lawmakers time to debate whether and how to replace some elements of the Obamacare law.

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Hundreds of insurers selling health plans in Affordable Care Act marketplaces are being paid less than 2 percent of nearly $6 billion the government owes them for covering customers last year with unexpectedly high medical expenses.

The $96 million that insurers will get is just one-fourth of the sum that provoked an industry outcry a year ago, when federal health officials announced that they had enough money to pay health plans only 12.6 percent of what the law entitles them to receive.

This time, the Obama administration made no public announcement.

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Federal regulators Thursday night extended the midnight deadline for Affordable Care Act insurance by four days, as consumers fought to get through to call center operators and log onto Healthcare.gov to buy insurance that takes effect Jan. 1.

“Nearly a million consumers have left their contact information to hold their place in line,” Healthcare.gov CEO Kevin Counihan said in a statement late Thursday. “Our goal is to provide affordable coverage to everyone seeking it before the deadline, and these two additional business days will give consumers an opportunity to come back and complete their enrollment for January 1 coverage.”

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Donald Trump’s White House and congressional GOP leaders are coalescing around an agenda focused on slashing taxes and repealing Obamacare early next year, a blueprint that could potentially avoid an intraparty clash over infrastructure investment early in Trump’s presidency.

On Wednesday morning, incoming White House Chief of Staff Reince Priebus said that the GOP will concentrate on budgetary issues and health care reform in the first nine months of the year. That largely overlaps with House Speaker Paul Ryan and Senate Majority Leader Mitch McConnell’s focus on tax reform and Obamacare repeal and suggests the party will spend much of its energy and momentum on those two issues.

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