The Trump administration had added extra inspections for passengers from Colombia as part of a pressure campaign. The effects lingered into Wednesday.

Border enforcement agencies have spent billions assembling surveillance tools to track and find people. These could be critical in President Trump’s immigration agenda.

The president-elect’s immigration advisers have warned Republicans that it will take time and money from Congress to carry out the mass deportation effort he has promised to execute immediately.

The move by an agency within the Department of Homeland Security was part of a broader effort by the Biden administration to strengthen oversight and set clear guidelines for handling intelligence.

President-elect Donald J. Trump picked the South Dakota governor to head the Homeland Security Department, which includes the Federal Emergency Management Agency.

Illegal crossings at the U.S.-Mexico border in November fell to their lowest level of President Biden’s administration.