Watch: Markwayne Mullin says he regrets calling Alex Pretti a "deranged individual"

Sen. Gary Peters, a Michigan Democrat, questioned Sen. Markwayne Mullin about international trips he's conducted while he was in Congress. Mullin, who is appearing for his Senate confirmation hearing to be the next DHS secretary, also said he regretted calling Alex Pretti a "deranged individual" after the Minneapolis resident was shot and killed by a federal agent in early January.