Ratings agency Fitch said on Tuesday it would place the U.S. credit rating on watch negative if its debt ceiling is not raised by August 2, when the Treasury has warned that it may not be able to borrow more.

If we reach the second of August without a lifting of the debt ceiling, Fitch would assign a rating watch negative to the U.S. sovereign ratings, Andrew Colquhoun, head of Asia-Pacific sovereign ratings with Fitch, said at a conference.

(Reporting by Masayuki Kitano; Editing by Kim Coghill)