President Joe Biden disembarks Air Force One after arriving at Catumbela airport in Angola on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden, center, and Angola's President Joao Lourenco, right, tour the Lobito Port Terminal in Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden and Chief Operating Officer of Lobito Atlantic Railway Nicolas Gregoire tour the Lobito Port Terminal in Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden, accompanied by Angola's President Joao Lourenco, center, and President Felix Tshisekedi of the Democratic Republic of the Congo visits the Carrinho food processing factory near Lobito, Angola on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden boards Air Force One at Quatro de Fevereiro International Airport in Luanda, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

A poster showing President Joe Biden and Angola's President Joao Lourenco is seen during a welcome ceremony at Catumbela airport in Angola on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden and Chief Operating Officer of Lobito Atlantic Railway Nicolas Gregoire meet rail workers during the tour of the Lobito Port Terminal in Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

A sniper stands on a platform during President Joe Biden's tour of he Lobito Port Terminal in Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

Angola's President Joao Lourenco participates in the Lobito Corridor Trans-Africa Summit at the Carrinho food processing factory near Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden and Chief Operating Officer of Lobito Atlantic Railway Nicolas Gregoire tour the Lobito Port Terminal in Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden watches a traditional dance after arriving at Catumbela airport in Angola on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden participates in the Lobito Corridor Trans-Africa Summit at the Carrinho food processing factory near Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden watches a traditional dance after arriving at Catumbela airport in Angola on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

Zambia President Hakainde Hichilema speaks during the Lobito Corridor Trans-Africa Summit at the Carrinho food processing factory near Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

Angolan Minister of Transport Ricardo Daniel speaks to President Joe Biden accompanied by, from his left, President Joao Lourenco of the Republic of Angola, President Felix Tshisekedi of the Democratic Republic of the Congo, President Hakainde Hichilema of the Republic of Zambia and Vice President Philip Mpango of the United Republic of Tanzania during a tour of the Lobito Port Terminal, in Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

From the left, Zambia President Hakainde Hichilema, Angola's President Joao Lourenco, President Joe Biden, President Felix Tshisekedi of the Democratic Republic of the Congo, and Vice President of Tanzania Philip Isdor Mpango pose for a photo during the visit to the Carrinho food processing factory near Lobito, Angola on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

President Joe Biden and Chief Operating Officer of Lobito Atlantic Railway Nicolas Gregoire tour the Lobito Port Terminal in Lobito, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

Angolan soldiers escort the motorcade of President Joe Biden in Luanda, Angola, on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)

A poster showing President Joe Biden and Angola's President Joao Lourenco is seen during a welcome ceremony at Catumbela airport in Angola on Wednesday, Dec. 4, 2024. (AP Photo/Ben Curtis)