"It's definitely hurt to see people peacefully protesting something and they're not in the wrong for protesting," Lillard said, according to ESPN's Royce Young. "And to be manhandled and physically taken off the streets and treated the way I saw in these video clips, it was disturbing."
The federal agents are being deployed by President Donald Trump, who has said he intends to send "a surge" of more officers into additional cities in the United States, including Chicago and Albuquerque, New Mexico, according to Reuters.
However, Oregon Gov. Kate Brown has called the officers' presence in Portland "a blatant abuse of power," and Mayor Ted Wheeler deemed it "an attack on our democracy," according to The New York Times' Sergio Olmos, Mike Baker, and Zolan Kanno-Youngs.
Protesters in Portland have been frequently demonstrating against police brutality and systemic racism in the city's streets since the death of George Floyd in police custody on May 25.
Lillard, who's currently in Orlando with the Trail Blazers preparing for the resumption of the season, says he was notified of the events by users on Twitter and has started gathering more information.
"I had a personal experience with a protest on a particular day and it was all peaceful," he said. "And every one I've seen video of has been peaceful, so I don't understand why federal troops need to be on the ground and physically removing people from the streets.
"It's unnecessary and definitely a scary situation, so it's something I've started looking into more of the last few days to learn more about."