If you want to know why President Joe Biden’s COVID-19 messaging is failing, the first place you should look is to the southern border.

Homeland Security Secretary Alejandro Mayorkas admitted that the roughly 15,000 migrants who had been squatting under the bridge in Del Rio, Texas, were not tested for COVID-19. Mayorkas even said that “we certainly had some people get sick,” though he said that none of them had COVID-19 “to my knowledge.” He also said that up to 30,000 illegal border-crossers have been encountered in Del Rio since Sept. 9.