I wish I could make more concrete policy recommendations, but in this case all I can say is “this looks troubling.” Here’s the letter I sent to my representatives today:
Dear Senator Feinstein,
In 2006, we learned that the NSA had secretly tapped all internet traffic flowing through AT&T’s San Francisco peering point. Now, the Guardian’s leaks suggest that the NSA has accrued phone and email records–some metadata, some full content–for millions of US citizens, and stored them for targeted analysis. The criteria for retention and analysis remain poorly understood.