In this Dec. 1, 2017 photo, Sen. John McCain, R-Ariz., leaves a closed-door session in the Capitol where Republican senators met on the GOP effort to overhaul the tax code.

In this Dec. 1, 2017 photo, Sen. John McCain, R-Ariz., leaves a closed-door session in the Capitol where Republican senators met on the GOP effort to overhaul the tax code.