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before the u.s. defaults. not everyone is confident a deal can be reached, with at least one top republican negotiator warning a deal could come together as soon as today or fall apart entirely. what is the mood on capitol hill right now? >> reporter: good afternoon. the mood is more optimistic than we've heard in days. negotiators here this morning are saying they think they're closing in on a deal and really it's all about having an agreement on the agreement and hashing out the remaining sticking points, which we're told are on work requirements and spending caps. we heard speaker...

hello, everyone. thanks for joining me this saturday. i'm fredricka whitfield. >> we begin this hour in washington where right now negotiators are back at the table as they race to end the debt ceiling standoff. republican leaders and white house officials are returning a short time ago, after a marathon session lasted well into the night, the clock is ticking, to get a deal in place, before the u.s. defaults on its loans. the national deficit continues to soar. with no rise to the borrowing limit, the u.s. will default on its loans which could be catastrophic to the economy. the tre...