[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/01/06/art.burriscap0106.gi.jpg caption="Roland Burris held spoke briefly in the shadow of the Capitol after being informed that his appointment certificate was invalid under Senate Rules."]
WASHINGTON (CNN) - Roland Burris was turned away from the Senate floor Tuesday as he sought to be sworn-in as the junior senator from Illinois, because the Secretary of the Senate said his certificate was not valid.
Why is the certificate not valid?
Secretary of the Senate Nancy Erickson said that since it did not have the Illinois state seal or the Illinois Secretary of State's signature it did "not comply" with Senate rules, in a statement she released after meeting with Burris Tuesday morning.
The certificate was presented to Erickson on Monday by Illinois Gov. Rod Blagojevich's chief of staff, and she retained the original copy.
Senate Democratic leaders oppose Burris' appointment to serve the remaining two years of President-elect Barack Obama's Senate term because they say Blagojevich, who is being investigated for allegedly trying to sell Obama's seat, should not be choosing the next senator.
Still, Blagojevich signed the paperwork and sent Burris to Washington. Burris meets with Senate Majority Leader Harry Reid, D-Nevada, and Senate Majority Leader Richard Durbin, D-Illinois, Wednesday to discuss the matter.
Click here to see Burris' Certificate of Appointment to the Senate