Four Senate Republicans will introduce legislation Wednesday that would provide the Senate with a last-ditch opportunity to repeal and replace Obamacare before a Sept. 30 deadline.

Sens. Lindsey Graham of South Carolina, Bill Cassidy of Louisiana and Dean Heller of Nevada have attracted a fourth GOP sponsor, Sen. Ron Johnson of Wisconsin, to a measure that would allow states to decide the fate of Obamacare.

The bill would provide the $1.2 trillion for Obamacare's Medicaid expansion and tax credits to states in an attempt to get the states to develop their own healthcare programs. The four lawmakers announced they will introduce the legislation on Wednesday and will be joined by former Sen. Rick Santorum, R-Pa.

It would be difficult for lawmakers to move it out of Congress this year.

The Senate parliamentarian ruled that in order to use a budgetary rule that would let it pass without any Democrats in the Senate, Obamacare repeal and replace legislation must pass by the end of this month. Passing it after September would require a new budget that sets up another privileged bill in the Senate that can move with only GOP votes.

Republican leaders have voiced tepid support for the effort and have not promised to take up the legislation, but President Trump has signaled he would sign it into law.