Senate Issues Subpoenas in Eavesdropping Investigation

"WASHINGTON, June 27 — The Senate Judiciary Committee issued a series of subpoenas to the White House, Vice President Cheney’s office". A committee has sent alot of notices to the Bush Administration. http://www.nytimes.com/2007/06/27/washington/27cnd-nsa.html?hp says that it is going to be a "major legal showdown between Congress and the Bush Administration." All the notices where about the NSA.