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See photos from Day 3 of the 2016 Summer Olympics in Rio de Janeiro.

Fifty prominent Republican foreign policy and national security experts -- many veterans of George W. Bush's administration -- have signed a letter denouncing Donald Trump's presidential candidacy and pledging not to vote for him.

The execution of an Iranian nuclear scientist accused of spying for the US is reverberating from Tehran to the presidential campaign trail.

Conservative Republicans have recruited a former CIA staffer and top House GOP aide to launch an independent White House bid against Donald Trump and Hillary Clinton.

They were one of the biggest favorites for gold -- but Serena and Venus Williams won't be topping the podium together at the Rio 2016 Olympics.

Edible marijuana offered at a quinceañera celebration is suspected of sickening 19 people Saturday night in San Francisco's Mission District, according to the city's Department of Public Health.

CNN's Drew Griffin investigates the growing questions about whether or not Donald Trump's own businesses hire Americans first.

"Unstable" ... "a screw loose" ... "unhinged" ... the campaign for president goes crazy. CNN's Jeanne Moos reports.

A second boxer at the Rio Olympics has been arrested and accused of trying to rape a housekeeper, a news agency reported Monday.

As a computer outage on Monday caused Delta flight delays and cancellations around the world, passengers flooded social media with photos of jam-packed waiting areas.

It is a moment that will live in political infamy. As he announced his candidacy for president of the United States, Donald Trump assailed Mexican immigrants as "people that have lots of problems." He accused them of bringing drugs and crime with them across the border and derided them as "rapists." Doubling down in the face of controversy, Trump added that they are "killers" as well. As with so much that Trump says, his comments were at once inaccurate and obscene. Recent studies show that immigration is associated with lower crime rates, and that immigrants are less likely to be criminals than are native-born Americans.

On Monday, Japanese Emperor Akihito delivered a rare televised address to the nation about his declining health and the burden of his duties. In doing so, he has launched a much-needed discussion about the role of the country's royal family -- and perhaps about Japan's future.

Delta Air Lines flights were grounded for at least six hours Monday by a global computer system outage, causing large-scale cancellations and stranding passengers.

In a rare televised speech, Japan's Emperor Akihito has addressed his people directly about his declining health.

Two foreigners were abducted in the western part of Kabul on Sunday evening local time, the city's police chief told CNN.

An Iranian nuclear scientist who once claimed he was kidnapped by the CIA has been executed after being accused of spying for the United States.

Several items of US military equipment displayed by ISIS in photos published over the weekend likely was either found or captured after recent battles in eastern Afghanistan, according to a senior defense official.

Terrorism isn't just an act of violence -- it's a political statement, the politically motivated killing of innocents. In the early years after the 9/11 attacks, declaring al Qaeda attacks incidents of terror seemed straightforward: Al Qaeda leadership selected targets and trained or inspired followers who took direction or guidance. And responsibility was clear since they generally claimed the attacks they conducted and rarely claimed attacks they did not.

Protesters interrupted Donald Trump 14 different times during his economic speech in Detroit.