Gonzalez is accused of scaling the White House perimeter fence, running across the lawn and entering the presidential mansion before agents stopped him. [...] the U.S. Secret Service is having preliminary discussions about setting up security screening checkpoints near public areas around the White House, a law enforcement official told The Associated Press on Sunday. Secret Service agents drew their weapons as they hurried White House staffers and journalists out of the West Wing through a side door. Less than 24 hours after Gonzalez's arrest, a second man was taken into custody after he drove up to a White House gate and refused to leave, Secret Service spokesman Ed Donovan said, prompting bomb technicians in full gear to search the vehicle as agents briefly shut down nearby streets.