Military and defense

The nuclear-powered submarine USS Michigan approaches to join the U.S. aircraft carrier USS Carl Vinson in drills near the Korean Peninsula, at Busan port in Busan, South Korea, Tuesday, April 25, 2017. North Korea marks the founding anniversary of its military on Tuesday, and South Korea and its allies are bracing for the possibility that it could conduct another nuclear test or launch an intercontinental ballistic missile for the first time. (Jo Jung-ho/Yonhap via AP)

The nuclear-powered submarine USS Michigan approaches to join the U.S. aircraft carrier USS Carl Vinson in drills near the Korean Peninsula, at Busan port in Busan, South Korea, Tuesday, April 25, 2017. North Korea marks the founding anniversary of its military on Tuesday, and South Korea and its allies are bracing for the possibility that it could conduct another nuclear test or launch an intercontinental ballistic missile for the first time. (Jo Jung-ho/Yonhap via AP)

FILE - In this Friday, April 7, 2017, file photo, U.S. President Donald Trump, left, and Chinese President Xi Jinping pause for photographs at Mar-a-Lago in Palm Beach, Fla. North Korea often marks significant dates by displaying military capability, and South Korean officials say there's a chance the country will conduct its sixth nuclear test or its maiden test launch of an ICBM around the founding anniversary of its military on Tuesday, April 25. Trump spoke by phone with both the Japanese and Chinese leaders Monday, April 24. China's official broadcaster CCTV quoted Xi telling Trump that China strongly opposed North Korea's nuclear weapons program and hoped "all parties will exercise restraint and avoid aggravating the situation." (AP Photo/Alex Brandon, File)

FILE - In this Friday, April 7, 2017, file photo, U.S. President Donald Trump, left, and Chinese President Xi Jinping pause for photographs at Mar-a-Lago in Palm Beach, Fla. North Korea often marks significant dates by displaying military capability, and South Korean officials say there's a chance the country will conduct its sixth nuclear test or its maiden test launch of an ICBM around the founding anniversary of its military on Tuesday, April 25. Trump spoke by phone with both the Japanese and Chinese leaders Monday, April 24. China's official broadcaster CCTV quoted Xi telling Trump that China strongly opposed North Korea's nuclear weapons program and hoped "all parties will exercise restraint and avoid aggravating the situation." (AP Photo/Alex Brandon, File)

U.S. Defense Secretary James Mattis , right, and U.S. Army General John Nicholson, left, commander of U.S. Forces Afghanistan, hold a news conference at Resolute Support headquarters in Kabul, Afghanistan, Monday, April 24, 2017. Mattis arrived unannounced in Afghanistan to assess America's longest war as the Trump administration weighs sending more U.S. troops. (Jonathan Ernst/Pool Photo via AP)

French centrist presidential candidate Emmanuel Macron leaves his apartment, in Paris, Monday, April 24, 2017. French voters shut out the political mainstream from the presidency for the first time in modern history, and on Monday found themselves being courted for the runoff election between populist Marine Le Pen and centrist Emmanuel Macron.(AP Photo/Thibault Camus)

In this March 30, 2017, photo, Moses Maldonado poses for a photo in front of a statue depicting pioneers in front of the Oregon Capitol in Salem, Ore. Maldonado, who attended a rally honoring farmworker organizer Cesar Chavez at the Oregon statehouse, is a 50-year-old undocumented farmworker who says he is afraid he will be picked up by federal immigration authorities when he leaves his house to go to the fields. (AP Photo/Gillian Flaccus)