Hundreds of people across the country were arrested during immigration crackdowns last week.
According to the Department of Homeland Security, raids in 12 states led to the arrests of more than 680 people for breaking immigration laws.
Homeland Security Secretary John Kelly said about 75 percent of those arrested were "criminal aliens" who had committed other crimes in addition to illegal immigration.
Kelly told reporters, "The people that ICE apprehend are illegal and then some."
During his confirmation hearing, Kelly told Congress that Obama's policies had demoralized immigration officers.
Kelly said, "I think their morale has suffered because of the job they were hired to do, and then in their sense, they were kind of hobbled — hands tied behind their back, that kind of thing. And now they feel more positive about things."