The FBI has about 1,000 open investigations into potential domestic terrorists, including people who may be linked to extremist white supremacy, white nationalism and environmental movements, the agency's new chief, Christopher Wray, told Congress today.

During his first testimony as FBI director, Wray said domestic terrorism is “a very, very serious” matter that the investigative agency spends “a lot of our time focused on.”

"We have about 1,000 open domestic-terrorism investigations as we speak," Wray told the Senate Homeland Security Committee.

Read more: ABC News