The Secret Service is considering screening tourists and other visitors at checkpoints before they enter the public areas in front of the White House in response to the episode Friday in which a man with a knife managed to get through the front door of the president's home after jumping over the fence on Pennsylvania Avenue, according to law enforcement officials.

As part of the screening, the Secret Service would establish several checkpoints a few blocks from the White House, the officials said. The screening would likely be limited to bag checks and not include measures taken at airports by the Transportation Security Administration, which include metal detectors and body scans.