The immigration blitz was action long promised by President Donald Trump who made mass deportation central to his campaign.

Bove previously issued a memo ordering federal prosecutors to investigate officials from sanctuary jurisdictions if they suspect interference with the deportation raids.

With two top Trump administration officials in Chicago, federal law enforcement began a “targeted” immigration blitz Sunday, according to a spokesman for U.S. Immigration and Customs

The number of arrests there was uncertain. Illinois officials, including the governor, said they had not been given advance notice.

A range of federal agencies conducted "enhanced targeted operations" in Chicago Sunday "to enforce U.S. immigration law and preserve public safety," a spokesperson for Immigration and Customs Enforcement said.

Trump border czar Tom Homan and TV personality Dr. Phil are in the city to observe the operations, according to reports.

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.

Chicago Mayor Brandon Johnson and Chicago Police Supt. Larry Snelling spoke out Tuesday on immigration enforcement in the city.

Federal agencies working in California pledged cooperation in immigration enforcement operations and posted photos of people being taken into custody.

Sources told NBC News that federal enforcement agencies will not conduct an operation in Aurora on Thursday as originally planned.

I am a member of the Sisters of Mercy of the Americas. I am writing to express my outrage at President Donald Trump’s focus on mass deportations of immigrants, closing of the southern border and use of military airplanes to deport immigrants.