The panel showed graphic and violent text messages and played videos of right-wing figures, including Alex Jones.
The hearing scheduled for 1 p.m. ET on Tuesday comes after Congress left Washington for a two-week recess.
It's the latest attempt by Homeland Security to draw attention to the threat posed by domestic violent extremism.Â
Niger's government has announced that the death toll from an attack by Islamic extremists on the military last week has risen to at least 89.
The mysterious hero who used a narwhal tusk to help subdue the London Bridge attacker last month has been identified as a British civil servant.
A Jewish civil rights group has added dozens of new entries to its online database of hateful symbols, slogans and memes that white supremacists have adopted and spread.
Amid a growing number of attacks by domestic extremists, efforts to have them labeled as terrorists or to criminalize domestic terrorism are gaining momentum.
A local official in northeastern Nigeria says suspected Boko Haram extremists have killed more than 60 people during an attack on villagers who were leaving a funeral.
U.S. Secretary of State Mike Pompeo is renewing calls for a resolution to a festering dispute between Qatar and four other Arab nations, all America's Mideast partners.
The United States military's Africa Command says that it has carried out six airstrikes in the Gandarshe area of Somalia.