A congressional debt limit disapproval process consists of the following steps:

• >Once the debt subject to the statutory debt limit is within $100 billion of the limit, the President may request an increase in the debt limit by sending a written certification to Congress that the outstanding debt is within $100 billion of the debt limit, and that further borrowing is needed to meet existing commitments. 
• >Congress has 15 days to deny the request, through enactment of a Joint Resolution of disapproval.
• >In both the House and the Senate, consideration of the Joint Resolution of disapproval is governed by expedited procedures.
• >If both Chambers pass the Joint Resolution of disapproval:
  • >>It is sent to the President for veto or signature.
    • >>>If the President vetoes the Joint Resolution, the Joint Resolution is returned to Congress.
    • >>>If the President’s veto is overridden by Congress, which requires a 2/3 vote of each Chamber, then the debt limit increase request is denied.

If a Joint Resolution of disapproval is not enacted within 15 days then the debt limit is increased pursuant to the President’s certification.