U.S. Republican Party Senators adopt a ban on earmarking, or setting aside money in bills for specific purposes specified by legislators.
- United States senators Ben Cardin (D-MD) and Marco Rubio (R-FL) file a bill restricting arms sales to the Philippine National Police over its drug war.
- The Republican-controlled United States House of Representatives votes in favor of the repeal of the 2010 Patient Protection and Affordable Care Act and passage of the House's 2017 American Health Care Act, by a narrow, 217-213 vote. Twenty Republicans and all Democrats opposed the bill, which now heads to the United States Senate for its legislative action.
- The U.S. Senate confirms Donald Trump's appointment of his former opponents in the presidential primaries, neurosurgeon Ben Carson and Governor of Texas Rick Perry, as Secretaries of Housing and Urban Development and Energy respectively, with the support of all Republicans and some Democrats.
- Connecticut Senator Chris Murphy ends a nearly 15-hour filibuster after Republican Party leaders reportedly agree to allow votes on two proposed gun control measures.
- Texas Senator Ted Cruz names former Republican presidential candidate Carly Fiorina as his vice-presidential running mate.