The Navy admiral nominated to be the next head of the troubled National Security Agency is expressing concerns about the U.S. government turning over the bulk collection of telephone data to an independent third party, saying it could result in higher costs and delays identifying potential threats.

Vice Adm. Mike Rogers, who also has been nominated to take over U.S. Cyber Command, provided the first glimpse into his views of the nation’s troubled surveillance programs in answers to a questionnaire submitted to the Senate Armed Services Committee. The document was obtained by The Associated Press.