The election between Democrat Jon Ossoff and Republican Karen Handel to replace the seat vacated by Tom Price becomes the most expensive congressional race in United States history.
- Campaigning ends and voting begins in the suburbs of Atlanta in the U.S. state of Georgia between Republican Karen Handel and Democratic Jon Ossoff, where Republican Handel wins the election by a narrow margin.
- Both Paul Ryan and Tom Perez plan to campaign for the local candidates Karen Handel and Jon Ossoff respectively.
- The campaign of Jon Ossoff wins a lawsuit extending voter registration.
- In a meeting for the NRA, U.S. president Donald Trump criticizes Democratic candidate Jon Ossoff.
- Local Republican candidate Karen Handel says she wants Donald Trump to campaign for her in the district.
- Democratic candidates face off with Republican candidates in a primary for a U.S. House seat vacated by Tom Price, now Health and Human Services Secretary, in a suburb of Atlanta, Georgia.
- U.S. lawmakers break for summer recess.
- United States President Donald Trump, together with Senators Tom Cotton and David Perdue, unveils the RAISE Act, a plan that would, if passed, reduce legal immigration to the U.S. by half each year, and implement a "merit-based system" prioritizing skilled workers, instead of the current family-based chain migration system.
- Teams of United States-based researchers, composed of American, Chinese and South Korean scientists, successfully edit a piece of faulty DNA that causes a deadly form of heart disease from cells in human embryos.
- The summit announces it is unable to gain agreement on climate change between the United States and the other 19 members of this international forum.