I think twice a week would be optimal. Every day is too much work, and every other day is still too often. Twice a week (I suppose Mon or Tues and Friday) would give us time to dig through major news cycles, catch up on analysis, and compare sources. The result would be a sort of annotated list of links to stories we view as important, with some commentary strewn in.

I can send over some similarly-themed writing my colleague and I did if you're interested in learning more.