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 ObamaU.S. war ship nears Chinese island in first navigation challenge under Trump: report Vicente Fox to Trump: You’re president for ‘the wrong reason’ Mnuchin asks Congress for clean debt hike before August MORE and GOP nominee John McCainJohn McCainOvernight Cybersecurity: Bad Russian intel may have swayed Comey's handling of Clinton probe | Apple sees spike in data requests | More subpoenas for Flynn | DOJ's plan for data warrants McCain: Dems killed Lieberman’s FBI shot When education is an ignored national security matter 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: