New Hampshire Republican Sen. Judd Gregg, a key participant in Saturday's late-night bailout negotiations, said Sunday afternoon that both presidential candidates played a part in the deal that was reached and that final congressional votes are likely Monday.

Gregg, the ranking Republican on the Senate Budget Committee, also said negotiators Saturday night were told in no uncertain terms from leading economists that a meltdown on Wall Street was imminent if the Bush administration's $700 billion plan was not approved as soon as possible.

"Getting this done soon, promptly, is absolutely critical to the confidence of the markets," Gregg said. "I can't understate that issue."

Both Democratic presidential nominee Barack ObamaBarack ObamaFor Trump, foreign policy should begin and end with China Harvard spat between Clinton, Trump camps proves Dems can't accept Trump's improving Wrestling mogul McMahon could slam her way into Trump administration MORE and GOP nominee John McCainJohn McCainA Cabinet position for Petraeus; disciplinary actions for Broadwell after affair Meet Trump’s ‘mad dog’ for the Pentagon Wrestling mogul McMahon could slam her way into Trump administration MORE were in close contact with the lead negotiators throughout the nine-hour session Saturday afternoon and evening, Gregg said, and he confirmed media reports that economists' perspectives were sought as well.

On other key points, Gregg said: