David Welna David Welna is NPR's national security correspondent.
David Welna 2010
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David Welna

Central American migrants line up to apply for jobs at a job fair in Tijuana, Mexico. More than two thousand migrants have applied for a one-year humanitarian visa that would allow them to hold jobs legally in Mexico. David Welna/NPR hide caption

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David Welna/NPR

Stuck In Tijuana, Many Central American Migrants Opt For A Job

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Central American migrants wait in line in hopes of receiving donated food and hygiene supplies, outside of a sports complex serving as a shelter for more than 5,000 Central American migrants, in Tijuana, Mexico. Rebecca Blackwell/AP hide caption

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Rebecca Blackwell/AP

Tijuana Residents Grow Irritated By Influx Of Central American Migrants

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Some Active Duty Soldiers Deployed To U.S.-Mexico Border Moved To California

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Members of the 89th Military Police and 541st Engineering Company, 19th Engineering Battalion at Fort Knox, Ky., are briefed upon arrival Wednesday at Lackland Air Force Base, Texas. They are among some 7,000 troops deploying to the U.S.-Mexican border. Senior Airman Alexandra Minor/Department of Defense hide caption

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Senior Airman Alexandra Minor/Department of Defense

First Wave Of Troops Sent To U.S.-Mexico Border Arrives In Texas

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President Ronald Reagan, right, and Soviet leader Mikhail Gorbachev sign the Intermediate-Range Nuclear Forces Treaty in the White House East Room on December 8, 1987. AFP/Getty Images hide caption

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AFP/Getty Images

Why Trump Is Determined To Leave Arms Control Treaty With Russia

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Polish President Wants U.S. Military Base

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Military Introduces Promotion Changes In Attempt To Attract And Keep Better Officers

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What's Changed In Afghanistan Since President Trump Decided To Stay

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Trump Signs Annual Defense Policy Bill, Lists Many Things He Doesn't Like About It

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North Korean leader Kim Jong Un shakes hands with U.S. President Trump during their summit on June 12 in Singapore. Kevin Lim/The Straits Times/Getty Images hide caption

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Kevin Lim/The Straits Times/Getty Images

Doubts Remain Over North Korean Denuclearization

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Defense Secretary Jim Mattis speaking to reporters aboard an armored version of a 747 which functions as an airborne command post. David Welna/NPR hide caption

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In A Tumultuous Administration, Defense Secretary Endures

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