Burris, Rejected by Senate, 'Weighs Options'

Instead of the signature of Illinois Secretary of State Jesse White, who has said he would not sign on to an appointment made by Blagojevich, Harris said he included with the credential a copy of a fax from White's office stating it had registered Blagojevich's intention to appoint Burris.

Roland Burris remains adamant that the U.S. Senate seat vacated by Barack Obama is his, despite the Senate parliamentarian's formal rejection of his claim.

(ABC)

Senators can allow Burris onto the Senate floor by unanimous consent. It is unclear whether they will.

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Burris said he would work hard to make his case to the Democratic leadership.

"I'm going to sell myself the same way I've sold myself to the people of Illinois. I've represented them for 20 years, in this great state," he said. "And I am a solution to the problem."

ABC News' Lisa Chinn and Kate Barrett contributed to this report.