Trump may visit Mexico before immigration speech

WASHINGTON - A campaign official says Donald Trump could make a last-minute trip to Mexico on Wednesday, hours before he delivers a highly anticipated speech on immigration.Trump has made illegal immigration and his call for a wall along the U.S.-Mexico border a centerpiece of his presidential campaign. However, he's suggested recently he could soften the hardline positions he staked out during the Republican primaries.Last week, Mexican President Enrique Pena Nieto extended an invitation to bot