At least 51 people who crossed the border illegally have been arrested on suspicion of terrorism since such tracking began 14 months ago, according to figures released to Rep. Tom Tancredo, R-Colo., by the Department of Homeland Security. Tancredo, a leading congressional advocate of immigration reform, says the figures document the national security risk the nation's porous borders pose on the eve of Congress' first attempt in nearly a decade to rewrite immigration law. Since October 2004, the Joint Terrorism Task Forces have kept track of arrested terrorist suspects who are in the U.S. illegally. The JTTF document released to...