The top U.S. auto-safety regulator told lawmakers Wednesday there is no way Takata Corp. can justify limiting an air-bag recall to only high-humidity states.

David Friedman, the deputy administrator for the National Highway Traffic Safety Administration, cited data that show humidity is less of a factor than first thought in the malfunction risk for driver¡¯s side air bags. He said NHTSA will hire within a week an independent expert to conduct more air bag tests.

¡°While it¡¯s true the automakers implement the actual recall, Takata is making the defective products and Takata should be declaring nationwide a defect in their products,¡± Friedman told reporters Wednesday after testifying to Congress. ¡°That will lead to a recall from all the automakers.¡±