European Commission President Ursula von der Leyen speaks during the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)

From left: Argentina's President Javier Milei, Uruguay President Luis Lacalle Pou, European Commission President Ursula von der Leyen, Brazil's President Luiz Inacio Lula da Silva and Paraguay's President Santiago Pena pose for a picture during the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)

Brazil's President Luiz Inacio Lula da Silva, left, talks with Paraguay's President Santiago Pena during the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)

Argentina's President Javier Milei, left, laughs beside Uruguay President Luis Lacalle Pou during the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)

Brazil's President Luiz Inacio Lula da Silva, left, talks with Paraguay's President Santiago Pena during the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)

From left: Argentina's President Javier Milei, Uruguay President Luis Lacalle Pou, European Commission President Ursula von der Leyen and Brazil's President Luiz Inacio Lula da Silva stand in front of photographers for a picture during the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)

Uruguay President Luis Lacalle Pou, left, greets European Commission President Ursula von der Leyen prior to the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)

Argentina's President Javier Milei, left, and Economy Minister Luis Caputo attend the Mercosur Summit in Montevideo, Uruguay, Friday, Dec. 6, 2024. (AP Photo/Matilde Campodonico)