3. Individual mandate repeal

Through tax reform, Trump fulfilled another key campaign promise: repealing Obamacare’s individual mandate.

Senate Republicans included a measure to kill the mandate in their initial tax bill, paving the way for its subsequent inclusion in the final tax reform package that cleared the president’s desk. The mandate, which required Americans to carry health insurance or pay an annual penalty as part of Obamacare, was long seen by GOP voters as the worst element of the 2010 healthcare law.

Public opinion polls taken in the months leading up to the final healthcare vote showed between 51 and 65 percent of self-identified Republicans opposed the individual mandate.

The White House has already signaled its eagerness to undo the rest of the healthcare law when Trump returns to Washington for his second year in office.