The effort to repeal and replace the Affordable Care Act is now a repeal-only effort.

The House of Representative in May had narrowly approved the American Health Care Act, a healthcare bill intended to replace the Affordable Care Act.

Republican Sens. Jerry Moran of Kansas and Mike Lee of Utah announced Monday evening that they would vote against a motion to proceed to debate on the bill, Business Insider reported. The bill could lose the votes of only two senators in order to move on; two other GOP lawmakers — Sens. Rand Paul of Kentucky and Susan Collins of Maine — had already expressed their opposition, bringing the total to four.

“I believe we must continue to push forward now,” US Senate Majority Leader Mitch McConnell, R-Ky., said today on the Senate floor. “I regret that the effort to repeal and immediately replace the failures of Obamacare will not be successful. That doesn’t mean we should give up. We will now try a different way to bring the American people relief from Obamacare — I think we owe them at least that much.”

McConnell said the Senate in the coming days will take up and vote on a repeal of Obamacare combined with a “stable, two-year transition period as we work toward patient-centered health care.” He said a majority of the Senate voted to pass the same repeal legislation in 2015 but President Obama vetoed it then.