A Massachusetts man was arrested after authorities say he entered the United States Capitol and took a tour of the building with a handgun in his possession.

We are severely disappointed in the security failure,” House Administration leaders said, vowing to scrutinize screening procedures.

The U.S. Capitol Police on Thursday said a man who passed a security checkpoint with a handgun and toured the chamber was arrested and charged.

All the living former presidents were there and the outgoing president amicably greeted his successor, who gave a speech ...