Greg Myre

The National Security Agency has a reputation as the nation's most secretive intelligence agency. But a new inspector general arrived this year and is calling for a "robust whistleblower program."

Former Staff Sgt. Ronald Shurer was given the medal for his life-saving actions in Afghanistan a decade ago. Now a Secret Service agent in Washington, he's been diagnosed with stage 4 lung cancer.

The nonpartisan report says the U.S. needs to undertake a long-term effort to prevent groups like the Islamic State and al-Qaida from getting a foothold in vulnerable countries.

While Washington is sleeping, a team at CIA headquarters is making the final edits to a leather-bound book with the country's most sensitive intelligence secrets — the President's Daily Briefing.

Tuesday marks the 17th anniversary of the al-Qaida attacks in 2001 that killed nearly 3,000 people. There's still no trial date for five men accused of planning that attack, and a new judge took over the case Monday in the military court at Guantanamo Bay, Cuba.

For the third time in recent days, former national security officials have signed a letter objecting to the president's decision to revoke the security clearance of former CIA Director John Brennan.

On Wednesday, President Trump revoked the security clearance of former CIA Director John Brennan, who served as director during the Obama administration. Brennan has been one of the most scathing public critics of the president.

Few have returned to the U.S. after traveling to Syria and Iraq, where they were linked to extremists. Two are women who say their husbands forced them to go, along with their small children.

Federal agencies are moving ahead to stop foreign interference in the midterm elections. But without direction from the White House, they are limited in what they can do.

The Main Intelligence Directorate of the Russian Armed Forces is accused of masterminding the assault on the 2016 presidential election. The agency has a history dating back to the Bolshevik Revolution.

The late South African leader would have turned 100 on Wednesday. As part of the commemorations, a new book brings together many of the deeply personal letters he wrote during his 27 years in prison.

Trump repeatedly offered support to Russian leader Vladimir Putin and refused to endorse the U.S. intelligence community's finding that Russia interfered in the 2016 election to help Trump.

U.S.-Russia summits have ignited, and defused, global crises. There was also the time the U.S. Secret Service found Boris Yeltsin in his underwear and slurring his words, desperate for a pizza.

At last month's summit between President Trump and North Korean leader Kim Jong Un, Pyongyang agreed to completely denuclearize. But doubts are emerging already about its intentions to follow through.

Homeland Security Secretary Kirstjen Nielsen has spent her career in and out of government working on issues of national security. None of her jobs, however, have been so controversial as her role in policing the U.S. border.

President Harry Truman pushed for the treaties and alliances that gave the U.S. a leading role in remaking the world following World War II. Today, President Trump questions their cost and relevance.

President Trump says, "I do. I do," when asked if he trusts North Korean leader Kim Jong Un. Trump said the North Korean nuclear program would be dismantled "very, very quickly."

When President Trump and Kim Jong Un meet on Tuesday, it will be the result of strenuous diplomacy by officials from the U.S., North Korea and other countries. Here are some of the key figures.

One of the greatest photographers of the 20th century, Duncan documented the Korean and Vietnam wars. He also produced multiple books on Pablo Picasso, more or less living in the home of the artist.

The CIA is often involved behind the scenes in the run-up to a presidential summit. But U.S. and Korean spy chiefs are playing an unusually prominent role this time around.