SAN FRANCISCO (AP) — Google is asking the Obama administration for permission to disclose more details about the U.S. government's demands for email and other personal information transmitted online in an effort to distance itself from an Internet dragnet. In a show of unity, Google rivals Microsoft Corp. and Facebook Inc. also supported the attempt to pressure the U.S. Justice Department to loosen the legal muzzle that limits disclosures about government surveillance authorized by courts to protect national security. Google made its plea in a Tuesday letter to Attorney General Eric Holder and FBI Director Robert Mueller.