WASHINGTON - President Bush knew Saturday evening that Vice President Dick Cheney had accidentally shot a hunting companion, but the information wasn’t made public until the next day by a private citizen, the White House acknowledged Monday. In a contentious media briefing, White House spokesman Scott McClellan said Cheney’s staff was focused on making sure that the shooting victim, Texas attorney Harry Whittington, was receiving adequate medical care after the shooting on the private Armstrong Ranch in south Texas. Whittington and Cheney were hunting quail together.