This is a great post on Funding the Deficit from Across the Curve, with some great comments.
The author opines:
I think that the Treasury will be hard pressed to raise that amount of money without some novel financing ideas.
In addition to a new 7 year note, and monthly 30 year bonds, one suggestion:
I think that the Treasury should take advantage of the current rate structure and should issue a chunk of 50 year bonds. Issuing these bonds at any rate below 4 percent seems like a steal to me. These are unusual times and Treasury should consider this unusual and unique funding approach.