WATCH: ‘Radical Islamist terrorism’ should be top DHS priority, Lieberman says

The top challenge for retired Gen. John Kelly, President-elect Donald Trump’s choice to lead the Department of Homeland Security, is fighting "radical Islamist terrorism," according to former Sen. Joe Lieberman.

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"The number one challenge of the Department of Homeland Security remains to protect our homeland and the American people at home from terrorism — radical Islamist terrorism," the former Connecticut Democrat-turned-independent senator said in an interview with The Hill's Molly K. Hooper.

Take a look at the video above to hear Lieberman detail the challenges ahead for the agency.