Mexico’s top diplomat for North America, Roberto Velasco Álvarez, rejected the ruling on the social media on Tuesday, saying that immigration policy was something to be negotiated between federal governments.

“Texas has taken a very combative stance,” said Rafael Fernández de Castro, director of the Center for U.S.-Mexican studies at the University of California, San Diego.

A senior Mexican foreign ministry official who was not allowed to speak publicly said that the Supreme Court ruling would not affect existing migration agreements between the two countries.

While Mexico has served as the United States’ immigration enforcer, often discouraging migrants from massing at the border, the country has also publicly pushed for two key policies to address the root causes that force people out of their home countries — such as poverty, violence, inequality and climate change — and expand regular pathways for migration.

He has also called on the United States to suspend sanctions against Venezuela and lift the blockade against Cuba, saying that such measures would reduce migration flows from those countries.

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