Reporting from, ahem, “elsewhere”, identifies the man and states he was arrested.
"Abbey Gate!” Steve Nikoui yelled down at the president. “Second Battalion, First Marines!”
Capitol Police escorted Nikoui, 51, out of the chamber around 10:15 p.m. and took him into custody.
He was charged with crowding, obstructing, or incommoding Congress, a misdemeanor that typically results in the offender’s release after paying a $50 fine.
Nikoui’s son, Lance Cpl. Kareem Nikoui, was killed by a suicide bomber outside Kabul’s international airport while trying to process evacuees from the Biden administration’s botched Afghanistan withdrawal in August 2021."
Some confusion in the State of the Union thread because what he was yelling was pretty much unintelligible on the live feed.
If you wanted to know what he was yelling about, welp, here you go!