US attorney conducting criminal investigation into Fox News

Attorney for Andrea Tantaros said a client received a grand jury subpoena.

— -- The Manhattan U.S. Attorney’s Office is conducting a criminal investigation into Fox News, an attorney involved and other sources familiar with the matter told ABC News.

Burstein said the subpoena didn't involve Tantaros but a different client, whom he did not name.

Fox News responded, saying in a statement, “Neither Fox News nor 21st Century Fox has received a subpoena, but we have been in communication with the U.S. Attorney’s Office for months — we have and will continue to cooperate on all inquiries with interested authorities.”