I did not see the press conference. But I heard he was behaving erratically, and did not identify himself as a US Senator. Not all members of Congress are immediately recognizable on sight. For all they knew, he was a raving lunatic.
I saw it, he barged in storming the podium demanding in a loud voice to be heard. The SS did exactly the right thing and reacted to the threat. And he did represent an immediate threat.
Padilla’s just a stupid loser looking for some free publicity.