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told bloomberg news has already resulted in a significant drop in illegal border crossings. those moves that president biden made at the border. the details on that in a moment, but first, the details on the new action from today. an immigration advocate calls it quote, the biggest thing since daca and that it is a smart political move by president biden. joining us now to talk all about it, get all the details, kelly o'donnell. nbc news homeland security correspondent, julia ainslie, david noriega and joyce vance, because there will be a legal component to this. to julia, walk us th...

Middle of next year. why shouldn't that be universally cheered? >> it is a very big deal, sweeping deal but there are a lot of ifs. is it going to work? the russians say they're speaking for assad. assad has not personally committed to this. he spoke to disclose in a week. what if he doesn't meet that deadline? the only enforcement is up to the u.n. and that's still to be negotiated and russia ruled out the use of force as a threat. that doesn't mean the president couldn't use force but with congress leaning against that with the american people against that, how credible a threat is that? >> ...

Middle of next year. why shouldn't that be universally cheered? >> it is a very big deal, sweeping deal but there are a lot of ifs. is it going to work? the russians say they're speaking for assad. assad has not personally committed to this. he spoke to disclose in a week. what if he doesn't meet that deadline? the only enforcement is up to the u.n. and that's still to be negotiated and russia ruled out the use of force as a threat. that doesn't mean the president couldn't use force but with congress leaning against that with the american people against that, how credible a threat is that? >> ...

The chemical weapons that he's got. >> right. >> and to get rid of them by the middle of next year. so why shouldn't that be universally cheered? >> well, it is a very big deal. it's a sweeping deal, but there are a lot of ifs. is it going to work? the russians say they're speaking for assad. assad has not personally committed to this. he spoke to disclose in a week. what if he doesn't meet that deadline? the only enforcement is up to the u.n., and that has still to be negotiated, and russia has ruled out the use of force as a threat. that doesn't mean the president couldn't use force, but wit...