House lawmakers on Tuesday will get their first opportunity since President Donald Trump took office to question Department of Homeland Security agency leaders about the White House’s illegal immigrant deportation operation.

The leaders of Immigration and Customs Enforcement, U.S. Customs and Border Protection, and U.S. Citizenship and Immigration Services will testify before the House Homeland Security Committee for its first oversight hearing for the trio of immigration agencies — and the hourslong showdown on Capitol Hill is expected to be a fiery one.