President Joe Biden’s response to the arrival of Haitian migrants at the border has angered top lawmakers in both parties, who aired a cascade of condemnations just as top officials are descending on Mexico City for a major dialogue with the southern neighbor.

“We write to add our names to the groundswell of voices expressing outrage and disappointment over the cruel treatment of Haitians at our border, and their summary deportations,” Senate Foreign Relations Chairman Bob Menendez, a New Jersey Democrat, wrote in a letter co-signed by Senate Majority Leader Chuck Schumer.