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WhiteHouse.com entered into an agreement to pay Larry Sinclair, the Minnesota man who claims he used drugs and had a sexual encounter with Sen. Barack Obama in 1999, a certain amount of money before Sinclair agreed to take a polygraph for the site, but now the site has reneged on the deal. This new twist is revealed within an e-mail sent on Tuesday from WhiteHouse.com founder Dan Parisi to Sinclair, which refers to Big Head DC’s Monday interview with Sinclair.

“I saw this interview this morning and posted your response in regards to another polygraph test,” Parisi writes in the e-mail. “It shows that you are doing another polygraph with results in this afternoon in violation of our agreement. I have instructed bank to stop payment on the $20,000 check this morning. The $10,000 in checks going to the charities are not effected (sic) and will be paid.”

Sinclair has vowed to take legal action against Parisi, if the check is not honored. “No polygraph has been done and you changed the terms of the agreement on your own on 2-21-08 so your refusing to honor your payment sheds light on your intent,” Sinclair wrote in an e-mail to Parisi today. “You have no grounds to stop payment on what you think might happen when it has not happened.”

Several claims WhiteHouse.com has made regarding the posting of the Sinclair polygraph, which was administered by controversial polygraph expert Ed Gelb, have not been honored to date. For instance, videos were supposed to be posted showing the administration of the test, but the site now claims the “incident needs to be laid to rest,” and plans to post the videos have apparently been scrapped.

Parisi and others associated with his business have not yet returned multiple requests for comment.