Vice President Kamala Harris chose Minnesota Gov. Tim Walz as her running mate on Tuesday, capping more than two weeks of speculation over who would join her at the top of the Democrat ticket. Walz said it was the "honor of a lifetime" to join Harris in the campaign.

Voters in Michigan, Missouri, and Washington State are heading to the polls to vote in primary elections. In Michigan, Democrats and Republicans are stepping up to replace Sen. Debbie Stabenow (D-Mich.). Voters in Missouri will also decide the fate of Rep. Cori Bush (D-Mo.).

Several Boeing and Spirit AeroSystems executives testified at a two-day hearing before the National Transportation Safety Board, which is investigating the midair blowout of an Alaska Airlines 737 MAX 9 door plug in January. The hearing reviews issues including 737 manufacturing and inspections, safety management, and quality management systems.