Three key panels are addressing some of the thorniest issues poised to make or break the Republicans' massive bill for Trump's agenda.

Republicans are steering clear of dramatic Medicaid cuts in their spending bill, instead opting for smaller changes backed by moderate and swing-state members who had balked at the prospect of slashing a program that covers more than 70 million low-income and disabled Americans.

It sets up a potential showdown with fiscal conservatives, who have pushed their colleagues to overhaul the program and want the final Republican tax package to cut as much money