…explained in 30 seconds by Russ Feingold:
I lived in France for just under two years. During that time the current version of FISA (which was just extended by voice vote for another 15 days to allow for more time to negotiate the next version) was in effect, and any of my phone calls home could have been monitored without judicial oversight, despite the fact I am an American citizen for whom no probable cause exists for any type of search.
“Trust us” wasn’t good enough for the founders, and it isn’t good enough for me.