It's pretty much just 'holding the floor'. As long as Sen Booker speaks business is somewhat brought to a standstill. At least business to be transacted on the Floor is. But more importantly, he's calling attention to what Scrotus and his cronies are doing. As long as he speaks the media is covering it.
He's doing what the late John Lewis called on all of us to do; “Speak up, speak out, get in the way. Get in good trouble, necessary trouble, and redeem the soul of America.”
John Lewis made this statement on the Edmund Pettus Bridge in Selma, Alabama on March 1, 2020 at the commemoration of the March on Selma.