Have any ratings agencies threatened a downgrade based on a failure to reach an agreement? S&P has threatened a downgrade if we raise the debt ceiling without

Have any ratings agencies threatened a downgrade based on a failure to reach an agreement? S&P has threatened a downgrade if we raise the debt ceiling without taking action to reduce the deficit significantly. However, assuming that we fail to reach an agreement, we will immediately reduce our deficit to zero and continue to be able to service our debts. Why would we expect this to trigger a downgrade?