“You can never be totally confident,” Trump said when asked about America’s northern border, before vaunting his Department of Homeland Security’s migrant round-ups.
Recent days have seen the arrest of hundreds of undocumented migrants across the United States.
“We’re actually taking people that are criminals — very, very hardened criminals in some cases, with a tremendous track record of abuse and problems, and we are getting them out,” Trump said.
Civil rights group say migrants with no criminal record are also being caught in the dragnet.