The DEA disclosed the existence of its surveillance for the first time in January, after a federal judge ordered the government to reveal more information about the program. The agency made the disclosure in a criminal case against a man accused of violating export restrictions on goods to Iran. In a declaration filed in the case, a DEA agent described the then-secret program of collecting telephone records of calls made from the U.S. to “designated foreign countries’’ that are connected with international drug trafficking.