British Prime Minister Keir Starmer, President Joe Biden and NATO Secretary General Jens Stoltenberg take their seats for a meeting of the NATO-Ukraine Council during the NATO summit in Washington, Thursday July 11, 2024. (AP Photo/Jacquelyn Martin)

President Joe Biden speaks at a news conference Thursday July 11, 2024, on the final day of the NATO summit in Washington. (AP Photo/Jacquelyn Martin)

A reporter stands to ask a question at the conclusion of a news conference with President Joe Biden following the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

President Joe Biden listens during a meeting with Ukraine's President Volodymyr Zelenskyy on the sidelines of the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

President Joe Biden sits as Secretary of State Antony Blinken, left, looks on during Working Session III of the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

President Joe Biden pauses at a news conference Thursday July 11, 2024, on the final day of the NATO summit in Washington. (AP Photo/Jacquelyn Martin)

President Joe Biden talks about children dying from gun violence as he speaks at a news conference Thursday July 11, 2024, on the final day of the NATO summit in Washington. (AP Photo/Jacquelyn Martin)

President Joe Biden speaks at a news conference following the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

Prime Minister of Portugal Luis Montenegro, left, speaks with President Joe Biden at Working Session II of the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

President Joe Biden, right, reaches to shake the hand of Ukraine's President Volodymyr Zelenskyy during a meeting on the sidelines of the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

President Joe Biden speaks during a meeting with Ukraine's President Volodymyr Zelenskyy on the sidelines of the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

President Joe Biden speaks at a news conference following the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Susan Walsh)

President Joe Biden speaks at a news conference following the NATO Summit in Washington, Thursday, July 11, 2024. (AP Photo/Matt Rourke)