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Alan Bersin, who worked closely with McAleenan in the Obama administration, said he did his job effectively in three administrations, Republican and Democrat, but was done in by a polarizing environment and lack of White House support.
McAleenan, acting Homeland Security secretary, stepping down →
Bersin said smugglers always seek to take advantage of perceived "loopholes," and they may view a lag in implementation as an incentive.
