Johnson spoke Wednesday after a closed-door meeting with Latino members of Congress who've been pressuring the administration to scale back the high number of deportations since President Barack Obama took office. Activists contend many people deported pose no threat.
With comprehensive immigration legislation stalled in the House, Obama announced last month that Johnson would be conducting a review to see if deportation practices can be more humane.
Johnson's meeting with the Congressional Hispanic Caucus was to discuss that review and hear the group's recommendations. The lawmakers want Obama to shield certain low-risk groups of immigrants from deportation, such as parents of U.S. citizen children.