1Clean Power Plan Regulations to curb pollution from coal-fired power plants.

2Deferred Action for Childhood Arrivals Protects undocumented immigrants who came to the United States as children.

3Deferred Action for Parents of Americans and Lawful Permanent Residents Intended to shield undocumented immigrants from deportation, but an appeals court ruling blocking the plan remains in place after a 4-to-4 tie in the Supreme Court.

4Waters of the United States Rule intended to protect waterways and wetlands.

5Affordable Care Act In an interview Friday, Mr. Trump indicated he might keep parts of President Obama’s signature legislative achievement.

6Dodd-Frank Overhauled regulation of the financial industry in the aftermath of the 2008 financial crisis.

7Defense sequester Automatic, across-the-board spending restrictions.

8Alternative minimum tax Aimed at making it harder for the affluent to take advantage of various tax breaks.

9Estate tax Currently applies to only about 5,300 of the richest families.

10Gun-free zones At military bases and at schools.

11Paris Climate Change Agreement Commits more than 190 countries to reduce emissions of carbon dioxide.

12North American Free Trade Agreement Trade deal signed by United States, Canada and Mexico more than 20 years ago.

13Trans-Pacific Partnership Trade deal among the United States and several Asian countries.

14Payments to United Nations’ climate fund

15Education Department It is “massive, and it can largely be eliminated.”

16Environmental Protection Agency “We are going to get rid of it in almost every form.”

17Undocumented immigrants with criminal records

18Federal funding of so-called sanctuary cities Places where local authorities have stopped cooperating with federal immigration agents.

19Common Core Learning standards for math and English.

20Syrian refugees Temporary ban.