The plot thickens.

In one instance, Mr Abramoff, who is serving a 70-month sentence on corruption charges, sent an e-mail to Susan Ralston, executive assistant to Karl Rove, the president's chief political strategist, on her RNC account about a gaming-related decision by the department of the interior.

When the e-mail was forwarded to another official in the White House e-mail system, Mr Abramoff was warned by an associate who said the official "said it is better not to put this stuff in writing in their e-mail system because it might actually limit what they can do to help us".

Mr Abramoff responded: "Dammit. It was sent to Susan on her RNC pager and was not supposed to go into the WH system."