Some Republican senators are hoping for a quick turnaround of its own version of legislation to repeal Obamacare, but major differences over Medicaid cuts already have become early sticking points.

A commission of 13 senators tasked with drafting their own bill is expected to meet this week, with some Republicans hoping they make quick work of the chamber’s own Obamacare replacement plan. The panel was created last week after the House passed the American Health Care Act by a 217-213 margin. The Senate aims to use some ideas from the House bill.