A delegation of senior White House officials held “collaborative and constructive” talks with the Mexican government in a bid to stem the flow of migrants to the southern border, a politically fraught crisis under the charge of Vice President Kamala Harris.

The delegation met with officials from Mexico’s Foreign Ministry, migration and development agencies, and was joined by top White House national security aide Juan Gonzalez, as well as Ricardo Zuniga, President Joe Biden’s Northern Triangle special envoy.