WASHINGTON (Reuters) - The White House branded Iran and Hezbollah on Saturday as a "global nexus of terrorism" and applauded an Argentine court for seeking the arrest of former Iranian officials in the 1994 bombing of a Jewish center. ADVERTISEMENT In the Bush administration's latest rhetorical assault on Iran, White House spokesman Tony Snow issued a statement saying the Islamic republic was responsible for the deaths of hundreds of innocent civilians as the world's "leading state sponsor of terrorism." It gave no specifics. The statement also said Tehran's financial and military support for Hezbollah had allowed the Lebanese Shi'ite militant...