WASHINGTON—President Bush collapsed in the Oval Office after spontaneously expelling a 3-pound kidney stone from his bladder, sources reported Tuesday. According to witnesses, the president was attending his daily Iraq War briefing when he suddenly began shrieking loudly and clutching his abdomen, a mixture of blood and urine pooling rapidly around his feet. Bush was able to maintain consciousness through more than 20 minutes of excruciating pain, even after the jagged, grapefruit-sized crystal aggregation shredded his urethra and dropped from his left pant leg, finally rolling to a stop on the presidential seal in the middle of the Oval Office carpet. Bush is resting comfortably at Bethesda Naval Hospital.