The United States Congress passes a bill containing measures recommended by the 9-11 Commission.
- U.S. President Donald Trump chooses not to certify that Iran complies with the 2015 agreement. The United States Congress now has 60 days to decide whether to lift the sanctions relief, possibly breaching the agreement.
- Business leaders from various U.S. companies, including Facebook, Marriott International, JPMorgan Chase, and Microsoft, lobby to members of Congress to work on a permanent solution for DREAMers to stay legally in the country, many of whom are their employees.
- Facebook agrees to disclose ads that ran in the U.S. in 2016 from accounts associated with a Russian entity known as the Internet Research Agency to United States Congressional investigators. Earlier, this information was provided to Special Counsel Robert Mueller.
- Negotiators from the Democratic and Republican parties agree on new sanctions against Russia, Iran, and North Korea. Both chambers of the United States Congress are scheduled to vote on passage on Tuesday.
- Nearly 200 members of the Democratic Party in the United States Congress file a lawsuit in the federal court, claiming that U.S. President Trump profits from business dealings with foreign governments, in violation of the United States Constitution's emolument clauses. This is the third such suit of its kind, following on the heels of the most recent suit by the Attorneys General of Maryland and the District of Columbia.