Typically they don't try to. But people have gotten into the capitol to interrupt things before. Five Congressmen were shot by Puerto Rican nationalists on th

Typically they don't try to. But people have gotten into the capitol to interrupt things before. Five Congressmen were shot by Puerto Rican nationalists on the floor of the house in the 50s. Protestors interrupt things fairly often. Happened during the Kavanaugh confirmation hearings and again during the vote. This is probably the most overwhelmed the Capitol has been since the British captured it.