Arnie Seipel

Updated at 3:32 p.m. ET

Governors in 30 states across the country have now publicly asked for the resettlement of Syrian refugees to stop until security concerns can be addressed.

Those states include: Alabama, Arizona, Arkansas, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Louisiana, Maine, Maryland, Massachusetts, Michigan, Mississippi, Ohio, Oklahoma, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, North Carolina, North Dakota, South Carolina, Tennessee, Texas, Wisconsin and Wyoming.

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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:

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

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