Jason Reynolds, pictured at the Edinburgh International Book Festival in 2019, has spent the last three years speaking with students across the United States in his role as national ambassador for young people's literature. Roberto Ricciuti/Getty Images hide caption
President Biden announced his intention to nominate Bridget Brink as the U.S. ambassador to Ukraine. The career foreign service officer has served as ambassador to Slovakia since 2019. U.S. Department of State/AP hide caption
President Trump's State Department has sent more political appointees abroad as ambassadors than have previous administrations. Yasin Ozturk/Anadolu Agency/Getty Images hide caption
Former U.S. Ambassador to Ukraine Marie Yovanovitch testifies before the House Intelligence Committee on Capitol Hill in Washington in November. Andrew Harnik/AP hide caption
Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee on Wednesday for his confirmation hearing to be the new U.S. ambassador to Russia. J. Scott Applewhite/AP hide caption
The British Embassy in Washington, D.C. Kim Darroch resigned as U.K. ambassador to the U.S. on Wednesday, after cables in which he criticized the Trump administration were leaked. Boris Johnson, expected to become the new prime minister, said nothing in Darroch's support. Pablo Martinez Monsivais/AP hide caption
U.S. Ambassador Terry Branstad shakes hands with Chinese President Xi Jinping at the Great Hall of the People on Sept. 30 in Beijing, China. Lintao Zhang/Getty Images hide caption
S. Fitzgerald Haney, former U.S. ambassador to Costa Rica, with his wife, Andrea, on that country's Dancing with the Stars. He is donating his stipend to a local cancer institute. Via Teletica hide caption
The White House announced Tuesday night that former Utah Gov. Jon Huntsman, shown here in 2012, is President Trump's choice to be the next U.S. ambassador to Russia. Charles Dharapak/AP hide caption
Some U.S. diplomats have taken to Twitter this week to distance themselves from President Trump's recent tweets about global affairs. Alex Brandon/AP hide caption
Russian Ambassador Sergey Kislyak arrives before President Trump's address to a joint session of Congress on Tuesday. Brendan Smialowski/AFP/Getty Images hide caption
New York Jets owner Woody Johnson speaks during a press conference in April at the team's practice facility in New Jersey. Adam Hunger/AP hide caption
Iowa Gov. Terry Branstad has been named as the next U.S. Ambassador to China. He's pictured here delivering his annual Condition of the State address before a joint session of the Iowa Legislature, in January. Charlie Neibergall/AP hide caption