Is nbc nightly news with brian williams. Good evening. During a time of heightened awareness of a potential terrorist threat, a man armed with a knife was able to jump the fence and make it inside the front door of the white house just four minutes after the president departed by helicopter on friday. Now the u. S. Secret service, especially the officers in uniform who patrol the white house lawn, find themselves facing some uncomfortable questions, like what if this assailant had been even more highly motivated or heavily armed . What if there had been several of them at once . Why is the fence relatively easily to climb and not electrified or curved or barbed at the top . No one wants a kremlin in the middle of washington. No one wants the peoples house to become a fortress. But securing what weve got and where our president s and their families live is tonight an issue. Its where we begin with nbcs kristen welker. Kristen, good evening. Reporter brian, good evening. There have been
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