The Politico reports:

White House Counsel Fred Fielding, in a letter today, told Rep. John Conyers (D-Mich.) and Sen. Patrick Leahy (D-Vt.), chairmen of the House and Senate Judiciary committees, that the White House has not budged in its refusal to allow the panels to question several White House aides, including Karl Rove, about what they know regarding the firing of eight U.S. Attorneys, moving the two sides closer to a constitutional battle over the scandal.

Fielding also appears to be trying to head off an attempt by Conyers to obtain e-mails and documents from the Republican National Committee regarding the firings. … Fielding also said that “it was and remains our intention to collect e-mails and documents from those [RNC-controlled] accounts as well as the official White House e-mail and document retention systems” as part of a broader deal with the two committees on staffer testimony.

In a response statement, Conyers was unmoved: “the Judiciary Committee intends to obtain the relevant emails directly from the RNC. The White House position seems to be that executive privilege not only applies in the Oval Office, but to the RNC as well. There is absolutely no basis in law or fact for such a claim.”

(Via Think Progress.)