John Sanders, then the acting commissioner of U.S. Customs and Border Protection, attends a news conference on Capitol Hill in 2019 during a surge of migrants at the U.S.-Mexico border, when at least five children died after being detained by federal authorities.

WASHINGTON, DC – MAY 15: Customs and Border Protection acting Commissioner John Sanders listens during a news conference where Lindsey Graham, (R-SC)., is proposing legislation to address the crisis at the southern border at the U.S. Capitol on May 15, 2019 in Washington, DC. Senate Republicans met with Vice President Mike Pence and White House Advisor Jared Kushner yesterday to discuss President Donald Trump’s plan to overhaul the immigration system. (Photo by Anna Moneymaker/Getty Images)