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Moody's says a future downgrade of the U.S. credit rating from AAA is possible. Also, global markets reacted harshly overnight to S&P's U.S. credit rating downgrade announced late Friday.

Global markets plummeted overnight night as news of the U.S. downgrade. Monday is the first day of trading in the U.S. and futures pointed sharply lower early by 6:30 a.m.

Overseas stocks are plunging following the devastating sell-off in the U.S. Thursday, ahead of a crucial July jobs report out of Washington.

A weary-looking President Obama told reporters late Sunday that a deal had been reached between the leaders of the White House, Senate and House of Representatives to raise the federal debt ceiling and avoid the first U.S. default, although a series of votes by all members in Congress is needed to make the ceiling raise a reality.