Mexico will not support U.S. deportation system

Mexico's mounting unease and resentment over President Donald Trump's immigration crackdown are looming over a gathering of U.S. and Mexican leaders that the U.S. had hoped would project a strong future for relations between neighbors.

There is no shortage of tension points as U.S. Secretary of State Rex Tillerson and Homeland Security Secretary John Kelly meet Thursday with top Mexican officials. After all, it's Kelly who's tasked with executing Trump's plan to target millions for possible deportation, and Tillerson who must explain it to the rest of the world.

As the pair arrived in Mexico City, the two countries seemed much farther apart than their close geographical proximity would suggest.

"I want to say clearly and most emphatically that the Mexican government and the Mexican people have no reason to accept unilateral decisions imposed by one government on another," said Mexico's foreign relations secretary, Luis Videgaray. "We are not going to accept that, because we don't have to."

Videgaray added a cryptic but pointed warning that Mexico wouldn't hesitate to challenge the U.S. move at the United Nations or other global venues.

The visiting Americans planned to meet Thursday with Videgaray before a working lunch with Mexican officials and a formal meeting with Mexican President Enrique Pena Nieto.