House Judiciary Committee Chairman John Conyers Jr. (D-Mich.) is giving the White House one last chance to comply with subpoenas for documents and testimony from Chief of Staff Josh Bolten and former White House Counsel Harriet Miers.

“I have written to you on eight previous occasions attempting to reach agreement on this matter,” Conyers wrote in a letter Monday to White House Counsel Fred Fielding. He said he was seeking to resolve the conflict one last time even as he filed a contempt citation with the House.

The move does not mean the House will ever vote on the contempt citation, but it gives Democratic leaders the option to bring the resolution up if and when they decide to vote on it. Conyers planned to file the citation with the House clerk Monday at 2 p.m.

Bolten and Miers were subpoenaed earlier this year as part of the Democrats’ ongoing investigation into the U.S. attorney firings. The Conyers letter is the ninth in a series asking President Bush to respond to the subpoenas. The Judiciary Committee passed contempt resolutions against Miers and Bolten at the end of July after they did not respond to subpoenas issued earlier this year.

Democrats want the White House to provide the Judiciary Committee with copies of documents relating to communications between White House staff and others outside the White House regarding the U.S. attorney firings.