<< No country in the Middle East would dare launch a rogue missile at us unless they were ready to pay the consequences... >>
the first threat is from north korea. north korea currently has 2 stage rockets that can reach alaska, and only need another stage to reach the US or orbit. north korea's leadership has shown that they care little for their citizens, and they are quite well dug in over there. the leaders go and hide in an underground shelter for a while. i doubt we'd even try to nuke north korea as it would have consequences in south korea, and maybe china or japan as well. MAD doesn't apply to them.
the next threat is from middle eastern countries. again the leadership in many of these states is well dug in, and has no regard for the common people. again, absolute destruction doesn't apply to them. it is forseeable that iran will have another revolution as hard-liners try to put down a liberal uprising. if the uprising is successful the last thing iranian hard liners would defend is nuclear missles which the chinese or maybe the russians would have not problem selling them. the hard liners would, in their final stand, launch their missles against pre-determined targets, probably the US and UK. israel too, i would imagine.
an ABM system is the only plausible defense against these scenarios, of which the north korean one is much more likely, though another decade will tell us if the middle eastern one is plausible.
another poster mentioned that only Dirty City (DC) would be protected, which is false. DC could be protected by an ABM system under the ABM treaty. the current system in discussion would protect most of the continental US from a korean attack with the missles based in alaska. middle eastern attack would be based elsewhere, not sure where, i'd have to go look at my notes which are 10,000 miles away.
the cons of course are that the missle system currently has a high miss rate. this system wouldn't be deployed for almost another decade, and the technology will improve in that space of time. i'd like to see how the system can avoid being duped by mylar balloons with heaters in them, though. pretty easy to make those, and in space they have about the same drag as the warhead itself. and of course putting a few of those along with MRVs could probably overload a handful of missles. we'd need 100 or so to be well protected.
EDIT: i imagine that congress, being in control of appropriations, has already thought of upping the CIA budget, which, remarkably, has been reported as already being done. in fact, congress gave the CIA several hundred million more than they requested.
EDIT2: making a suitcase bomb is very hard. requires some tech to get rather high yields, and anyone who doesn't have a lot of nuclear experience is going to overbuild it to make sure it goes off. they'd have to purchase one from the russians. of course, the russians couldn't find all of them in an audit, but russians don't keep very good records and the Lt. at the bottom looking through the record probably didn't look real hard either.