GOP Sens.(Tenn.),(Ohio),(Maine), Bill Cassidy (La.) and(Alaska) filed an amendment on Monday that would give congressional committees until March 3 to come up with a repeal plan.

Under rules the Senate is expected to pass this week, which are attached to a shell budget resolution, lawmakers have until Jan. 27 to replace the healthcare law.

"By providing more time to come up with legislative solutions, we have a better opportunity to produce a thoughtful, workable replacement that ensures Americans have access to affordable, diverse insurance plans that meet their needs," Collins said in a statement.

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Collins wants lawmakers to at least have a "detailed framework" for replacement before they vote to repeal ObamaCare.

A small but growing number of GOP lawmakers have voiced concerns about repealing the law without a replacement plan.

GOP leadership needs at least 50 votes, expected to all come from Republicans, to pass the rules to get rid of ObamaCare, as well as the separate stand-alone repeal legislation.

That means they can only afford to lose two GOP senators without having to try to flip Democrats or ask the vice president to potentially break a tie.

Sen. Bob Corker (R-Tenn.) argued that GOP lawmakers should side with Trump, who backed moving repeal and replacement together during the White House race.

"By extending the deadline for budget reconciliation instructions until March, Congress and the incoming administration will each have additional time to get the policy right," he said.

“I hope so, we're actually looking to try to find some way to do that,” Cornyn said, without providing details on what could be included.