Vow comes during meeting with Mexican president in Chile SANTIAGO, Chile -- President Bush vowed Sunday to push a plan that would allow undocumented immigrants to remain in the United States as guest workers even though it appears less likely to win backing in a Congress that grew more conservative in this month's elections. Bush made the commitment during a half-hour meeting with Mexican President Vicente Fox in the Chilean capital, where the two leaders are attending the annual Asia Pacific Economic Cooperation conference. But neither Bush nor his aides could offer any details of where the plan stood on...