Two of the country’s top intelligence officers say the man behind the WikiLeaks organization, Julian Assange, has no credibility and has done damage to the United States.

Speaking at a Senate Armed Services committee hearing Thursday morning, Director of National Intelligence James Clapper and National Security Agency director Michael S. Rogers were both asked about Assange, whose WikiLeaks organization has published critical and classified American intelligence and diplomatic correspondence, by committee chairman John McCain. Assange claims the theft of embarrassing emails from Democratic National Committee officials, which WikiLeaks published earlier this year, was not backed by the Russian government.