President George W. Bush, warned the U.S. Congress against fearmongering on Monday as the Senate tackled immigration reform, an issue that has split his Republican party and spurred huge protests. ``The immigration debate should be conducted in a civil and dignified way,'' Bush said, pushing his own proposals at a swearing-in ceremony for 30 new American citizens. With his job approval rating at the lowest of his presidency, Bush faces a new test of his political strength on the divisive immigration issue. ``No one should play on people's fears or try to pit neighbors against each other,'' he said. ``No...