Border czar Tom Homan told NBC News that several people with criminal convictions were apprehended in Chicago.

Acting Deputy Attorney General Emil Bove, appointed by President Donald Trump, will oversee the efforts of the FBI, DEA, ATF, U.S. Marshall Service, and federal prosecutors.

Since Trump took office, similar immigration enforcement operations have been publicized around the country, which U.S. Immigration and Customs Enforcement says are ongoing.

Hours after being sworn in, President Trump fulfilled his campaign promises to crackdown on illegal immigration. The President declared an emergency at the southern border, and as a result, there have already been many changes to policy.

President Donald Trump spent his first week in office bringing the U.S.-Mexico border to the nation’s center stage. NewsNation has tracked what’s happened so far in its special coverage, “Crisis on the Border.