[GrantDawg]

Originally Posted by Comey

I found this. Unsure how a vote would go to rejoin, needing 2/3 to get there.

The US is Out of the Open Skies Treaty. What’s Next? - Air Force Magazine

I do think there are Republicans that would be for returning to the treaty, but even if not:
Pifer also suggested the U.S. could pursue an executive agreement to rejoin the treaty that could earn the votes of simple majorities in the House and Senate, and the approval of the other 33 Open Skies signatories.