U.S. Homeland Security chief Alejandro Mayorkas said on Tuesday the government of President Joe Biden has delivered a very clear message the Mexico-U.S. boundary isn’t open, when speaking about irregular migration to the USA.

Mayorkas, on a visit in Mexico City, said he spoke with Mexican Foreign Minister Marcelo Ebrard regarding migration, commerce, public health in the border and financial struggles.

The Homeland Security secretary’s trip to Mexico City comes amid months of large migration that has come to be an early policy challenge for the Biden government, as hundreds of thousands of individuals flee poverty and violence in Central America and parts of Mexico.

During a news conference, Mayorkas said both Mexico and the United States were working to curtail intermittent migration, with the United States pushing Mexico to perform more, and Mexico also pushing the usa.

“We have challenged one another with respect to what more each one of us can do to address the irregular migration that has persisted for several months,” he said.

“It’s not just a question of the U.S. asking of Mexico, it’s a matter of what we both can do.”

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In his meeting with Ebrard and other top Mexican officials, he also discussed efforts to speed up vaccinations along the shared border, in efforts to phase out pandemic-related travel restrictions.

Yet, he said that the United States is not considering implementing a vaccine passport at the U.S.-Mexican border.

Separately, former President Donald Trump said on Tuesday he would visit the Texas-Mexico border later this month with Texas Governor Greg Abbott, after both have complained about a rise in migrants crossing into the United States.