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ARI SHAPIRO, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

MARY LOUISE KELLY, HOST:

On a sunny Tuesday afternoon in September, Liang Xiaojun received a knock on the door. "There were 15 of them: national security police, regular police, justice bureau folks," he remembers.

Liang is a human rights lawyer in Beijing, an endangered species since 2015, when China's government questioned or detained more than 200 of his colleagues. Now he wonders if they're coming for him.

"They told me this was just a preliminary check. Next week, they'll send more police. It's possible they'll arrest me, but I mustn't live in fear."

The Pentagon is tightening the screening process for immigrants who volunteer for military service and slowing their path to U.S. citizenship.

The U.S. military will no longer allow green card holders to enter basic training before the successful completion of a background check. The policy change is intended to improve security vetting of foreign-born recruits.

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