Bush Won't Supply Subpoenaed Documents

President Bush, moving toward a constitutional showdown with Congress, asserted executive privilege Thursday and rejected lawmakers' demands for documents that could shed light on the firings of federal prosecutors.

Bush's attorney told Congress the White House would not turn over subpoenaed documents for former presidential counsel Harriet Miers and former political director Sara Taylor.

In reaction, Senate Judiciary Chairman Patrick Leahy accused the administration of shifting "into Nixonian stonewalling" and revealing "disdain for our system of checks and balances."