A U.S. senator says immigration authorities should be on hand to arrest illegal aliens who show up to get the controversial Matricula Consular cards issued by the Mexican government. Sen. David Vitter, R-Louisiana, asked U.S. Immigration and Customs Enforcement to place agents this weekend outside a municipal building in Lafayette, La., where Mexican consular officials had planned to issue the cards, which can be obtained by any Mexican living outside Mexico. Critics say the cards are a magnet for illegal aliens because they convey the trappings of legal status. "The Mexican government makes it perfectly clear in advertising this that...