Repealing the ACA would take an act of Congress, as would levying some types of tariffs on corporations that move operations overseas, ending regulations that limit pollution and coal production, getting rid of gun-free school zones, and renegotiating the Iran nuclear deal. He would have the authority to renegotiate trade deals such as the North American Free Trade Agreement that he has long railed against — and to withdraw with six months’ notice if he wished — but such a move could be catastrophic for stock markets and the economy.

For years, Republicans on Capitol Hill have tried to shred Obama’s signature health-care law, only to be stopped by the president. But after holding their majorities, they are finally in position to make it happen in conjunction with the new Republican president.

While Trump spent countless hours on the campaign trail assailing the law, he has yet to fully articulate what he would offer as an alternative. Trump said that he would encourage health savings accounts, allow insurers to sell policies across state lines and convert Medicaid from an entitlement program to a block grant to states — ideas long favored by GOP conservatives. As for the rest of Trump’s plan, he has assured supporters that it will be something “terrific” that is “so much better, so much better, so much better.”