If no clear winner emerges on election night, experts in global conflict warn that protesters and counterprotesters could clash in the streets, making conditions ripe for potential violence.

Five people have been arrested and others are facing criminal charges in what Justice Department leaders called a plot by China's government to lean on political opponents with threats and extortion.

Dozens of U.S. diplomats in Cuba and China have complained of chronic, unexplained ailments. Now an ex-CIA official says he had to retire after a trip to Russia led to debilitating migraines.

Voters and national security officials are focused as never before on assuring the security of the election. Here's what you need to know in the final days of voting.

Uniformed police are generally not allowed around polling places, and the Pentagon doesn't want to get involved. Still, they're getting ready if things get out of control.

Cyber experts told the Department of Homeland Security in July that voter registration systems in California and Florida could be vulnerable to a hack, a closely-held report obtained by NPR reveals.

A report published on Thursday described how many government and political domains don't observe a security practice that makes it more difficult for attackers to run spoof email scams.

Georgia, Michigan, Pennsylvania, Wisconsin and Oregon have the highest risk of seeing increased militia activity around the elections, according to a new report obtained exclusively by NPR.

On Wednesday, the government reported foreign actions, taken to affect public opinion related to U.S. elections. It comes after voters in Alaska and Florida reported receiving threatening emails.

The director of national intelligence and the FBI director said on Wednesday night that U.S. officials believe Iranian influence-mongers are behind an election-intimidation scam.

Cybersecurity experts say the origin of the messages remains unknown and may be the product of a foreign disinformation effort.

Prosecutors linked the men with a globe-hopping campaign of sabotage, espionage and election interference. They work for the same spy agency that targeted the U.S. in 2016.

Former national security adviser John Bolton says President Trump's decision-making "does not produce a coherent, effective, sustained policy."

Here's how the national security priorities of the Republican president and his Democratic challenger compare.

National security leaders are playing a far more prominent role than in previous elections. Current officials are trying to reassure voters. Many former leaders are criticizing the president.