Cornyn: 'Grave concerns' over Johnson leading DHS

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If confirmed, Johnson would replace former DHS chief Janet Napolitano, who left her post last month to become the next president of the University of California.

But Johnson's ties to the White House, as well as his involvement in Obama's 2012 reelection campaign, have raised doubts over his qualifications to lead the DHS, according to Cornyn.

The administration's "mismanagement" of America's borders, particularly the southern barrier between Texas, Arizona and Mexico has led to a steady uptick of violence and drug trafficking along that southern corridor.

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