Two distant cousins connect online, only to learn that one is a militant leftist and the other is in a right-wing militia. Their story shows the complexities of a timely question: Who's an extremist?

In the fight against violent extremism, there's a hot debate: Who's an extremist? Two cousins, one a far-right militia member and the other aligned with Antifa, bring that debate to life.

This week in both House and Senate hearings, police officials testified on the Jan. 6 insurrection. The rise of right-wing extremism might make preventing the next violent outbreak more challenging.

The Department of Homeland Security recently issued a bulletin warning of violence by domestic extremists. How is the government dealing with these threats?

Some 25,000 National Guard members are in the city where insurrectionists stormed the U.S. Capitol just two weeks ago.

As thousands of security forces deploy nationwide in anticipation of unrest ahead of the inauguration, there has been a national reckoning over how seriously to take the right-wing extremist threat.

Many of President Trump's extremist followers expressed white supremacist views when they attacked the U.S. Capitol last week. What will come of them when Trump leaves office in ten days?

Five people died following the storming of the Capitol building, including a police officer. The attack renewed criticism over how officials are addressing the growing threat of far-right extremism.

One of the most shocking parts of Wednesday's pro-Trump mob attack on the U.S. Capitol was just how quickly it all unfolded. We examine the historic, and troubling day.

After the president addressed the crowd gathered to protest President-elect Joe Biden's win, Trump supporters pushed past barriers onto the Capitol grounds.

As thousands of supporters of President Trump converge again on Washington, D.C., to reject election results based on debunked claims of fraud, Congress is expected to certify the results.

From President Trump's phone call to Georgia officials demanding to "find" more votes to Trump supporters heading to D.C. to reject the election results — disinformation is playing a key role.

Police in Nashville, Tenn., were warned in 2019 that Anthony Warner was building explosive devices. Authorities had previously said Warner, who detonated a bomb on Christmas Day, was unknown to them.

The many unknowns in the Christmas Day bombing in Nashville, Tenn., have raised questions about whether the incident should be classified as a terrorist act.

Terrorism analysts warn that the country's polarization isn't just damaging to U.S. politics — it's a national security threat.

A group of bipartisan, former national security officials are warning that the ever deepening political divisions in the U.S. are a true national security threat.

The latest national rallies to protest the 2020 election results drew crowds of President Trump's most ardent supporters to Washington, D.C., and several state capitols.

Kyle Rittenhouse, the teenager charged in the shooting deaths of protesters in August, is free on $2 million bail. The money was raised mostly by right-wing donors, who portray him as a hero.

The data for 2019 show a slight overall increase but offenses were more violent than in previous years. About half of the 51 bias-motivated homicides stemmed from the Walmart mass shooting in Texas.

The Million MAGA March drew a mix of conservative Republicans, far-right extremists and conspiracy theorists. Extremism analysts say their cooperation is a troubling sign.