Ukrainian President Volodymyr Zelensky meets with Congress, President Joe Biden returns from the U.N. General Assembly and Attorney General Merrick Garland is grilled over Hunter Biden and Donald Trump cases, among the highlights of this week in Washington.

Britain's Prince William visits a FDNY Firehouse and holds the Earthshot Prize Innovation Summit in New York City on September 19, 2023. The event announced the 15 innovators in the running to win one of five grants to help fight climate change. William also met with world leaders as the U.N. General Assembly takes place.

Former President Bill Clinton and former Secretary of State Hillary Clinton, along their daughter, Chelsea, host the 2023 Clinton Global Initiative event in New York City, which runs through September 19. The event brings together global leaders to discuss solutions to the world's most pressing challenges.

United Auto Workers go on strike outside the Stellantis plant in Toledo, Ohio -- where Jeep Wranglers and Gladiators are made -- on September 18, 2023. UAW workers at Ford, General Motors and Chrysler's parent company Stellantis began their strike on Friday, seeking a 40% pay raise.

U.S. Sen. Mitt Romney, R-Utah, has announced he won't seek re-election in 2024, calling for a new generation of leaders. Romney, 76, a former governor of Massachusetts, has served in the Senate since 2018. He ran unsuccessfully for president against Barack Obama in 2012. In 2020, Romney was the lone Republican to vote to convict President Donald Trump in his first impeachment trial.

First lady Jill Biden and former Secretary of State (and former first lady) Hillary Clinton host an event at the White House for the Praemium Imperiale Laureates on September 12, 2023. The global arts prize is awarded annually by the Japan Art Association for lifetime achievement. The laureates were first celebrated at the White House by Hillary and President Bill Clinton in 1994.

With the campaigns to re-elect President Joe Biden, 80, and former President Donald Trump, 77, and health concerns surfacing about some long-serving political leaders, age is on the minds of the electorate. Here are the 50 members of Congress age 75 and older.

Americans mark the 22nd anniversary of the Sept. 11, 2001 attacks with memorials and commemoration ceremonies in New York City, at the Pentagon and in Pennsylvania, where hijacked planes crashed. Nearly 3,000 people were killed in the worst-ever terrorist attack on U.S. soil.

Former Donald Trump aide Peter Navarro arrives for the third day of his contempt of Congress trial, President Joe Biden finalizes a new labor contract covering West Coast ports and awards the Medal of Honor to Army Captain Larry Taylor, among the highlights of this week in Washington.

U.S. Air Force Thunderbird jets command the skies at the annual Cleveland National Air Show over Labor Day weekend. The 2023 event drew more than 100,000 spectators to Burke Lakefront Airport.

President Joe Biden delivers the August jobs report, meets with Costa Rican President Rodrigo Chaves Robles, announces the the initial slate of 10 prescription medicines eligible for Medicare price negotiations and marks the 60th anniversary of the March on Washington, among the highlights of this week in Washington.

President Joe Biden and first lady Jill Biden welcomed students for a new school year at Eliot-Hine Middle School in Washington on August 28, 2023. The Bidens met with students and visited classrooms.

NASA's SpaceX Crew-7 launched from the Kennedy Space Center in Florida onboard the SpaceX Crew Dragon spacecraft named Endurance on August 26, 2023. The crew successfully docked with International Space Station, where they will spend six months aboard.

Vice President Kamala Harris hosted the Las Vegas Aces, who won the 2022 WNBA Championship, at the White House in Washington on August 25, 2023. Harris was presented with her own basketball jersey.

Former President Donald Trump and 18 other defendants surrender to authorities at the Fulton County Jail in Atlanta to face charges related to efforts to overturn the 2020 presidential election in Georgia. Here are their mug shots.

Republican presidential hopefuls, minus Donald Trump, participated in the first primary debate at the Fiserv Forum in Milwaukee on August 23, 2023. Florida Gov. Ron DeSantis, former Vice President Mike Pence, entrepreneur Vivek Ramaswamy, North Dakota Gov. Doug Burgum, former South Carolina Gov. Nikki Haley, former Arkansas Gov. Asa Hutchinson, former New Jersey Gov. Chris Christie and South Carolina Sen. Tim Scott took part in the debate.

President Joe Biden hosted Japanese Prime Minister Fumio Kishida and South Korean President Yoon Suk-yeol during a trilateral summit at Camp David in Maryland on August 18, 2023. The meeting was an effort to unite the frayed allies in response to increasing military threats in Southeast Asia.

President Joe Biden and members of Congress celebrate the one-year anniversary of the Inflation Reduction Act, and FEMA Administrator Deanne Criswell speaks on the response to the Maui wildfires, among the highlights of this week in Washington.

Warmer than normal sea temperatures are affecting coral and the overall health of the reef system in the Atlantic Ocean off the Florida coastline. UPI Photographer Joe Marino captures underwater images off Boynton Beach showing some coral in distress.

Thousands of Los Angeles city workers launched a one-day strike and demonstrated in front of Los Angeles City Hall amid slow-moving contract negotiations on August 8, 2023. Members of the Service Employees International Union say vacant positions at many agencies are forcing workers to take excessive overtime.