WASHINGTON, Dec. 13 (UPI) -- U.S. Senate Democrats should know issuing contempt citations and pursuing a criminal case in the firings of U.S. attorneys is futile, the White House said.

Dana Perino, White House press secretary, said Thursday the Senate Judiciary Committee's issuing contempt citations against former White House adviser Karl Rove and White House Chief of Staff Joshua Bolten is pointless because "the constitutional prerogative of the president would make it a futile effort for Congress to refer contempt citations to U.S. attorneys."

The committee issued citations because Bolten did not provide information or documents in the firing of nine U.S. attorneys. Rove, who resigned as deputy chief of staff in August, was cited because he did not appear before the committee to testify. The White House said Rove was immune because of executive privilege.

"The Department of Justice would not require a U.S. attorney to convene a grand jury or otherwise pursue a prosecution of an individual who carries out a president's instruction not to provide documents or testimony on the basis of the president's assertion of executive privilege," Perino said.

The matter will go before the full Senate.