Republican senators sifted through familiar procedural hurdles toward a final vote on legislation that would dramatically transform the tax code and Medicaid.

Senate Democratic Leader Chuck Schumer of New York said the “hardest choices” for Republicans are still to come. His side plans to bring “amendment after amendment after amendment to the floor, so Republicans can defend their billionaire tax cuts and so they can try to explain their massive cuts to Medicaid to people back home.”

A marathon voting session on President Donald Trump’s sweeping domestic policy bill is underway in the Senate after a weekend of negotiations and delays.