The U.S. intelligence chief says there is an increased threat that Iran could conduct an attack on U.S. soil in the wake of last year’s failed plot to assassinate the Saudi Ambassador to the United States. U.S. Director of National Intelligence James Clapper presented his annual assessment of the worldwide threats to U.S. national security the Senate Intelligence Committee on Tuesday, with Iran at the forefront of the discussion. Clapper said in prepared remarks that Iranian leaders are “now more willing to conduct an attack on the United States” in the case of a “real or perceived” threat by the U.S. to the regime.