Arnie Seipel

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Security restrictions have gone into place across France and also here in the United States. NPR's Arnie Seipel has more.

This has been the Summer of Trump on the campaign trail. Donald Trump has flown high in the polls, with seemingly nothing emerging to slow his rise.

But as heading into September, here are three hurdles the reigning Republican front-runner might have to contend with that run counter to his success so far:

President Obama wants to close the prison at the U.S. Navy base at Guantanamo Bay before leaving office. But his departing defense secretary, Chuck Hagel, told NPR News the job is "going to be very difficult" to complete in that time.

Hagel made that remark in an exit interview Friday, one of only a handful he granted as he prepared to vacate his expansive office at the Pentagon. The interview will air Monday on Morning Edition.

This story is part of the New Boom series on millennials in America.

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