WASHINGTON — The new director of national intelligence told Congress on Thursday that global economic turmoil and the instability it could ignite had outpaced terrorism as the most urgent threat facing the United States.

The assessment underscored concern inside America’s intelligence agencies not only about the fallout from the economic crisis around the globe, but also about long-term harm to America’s reputation. The crisis that began in American markets has already “increased questioning of U.S. stewardship of the global economy,” the intelligence chief, Dennis C. Blair, said in prepared testimony.

Mr. Blair’s comments were particularly striking because they were delivered as part of a threat assessment to Congress that has customarily focused on issues like terrorism and nuclear proliferation. Mr. Blair singled out the economic downturn as “the primary near-term …