Unwinding Most Favored Nation pricing deals after the Trump Administration ends may be difficult, CMS Administrator Mehmet Oz said, and may not entirely be in manufacturers' control. If Congress does not codify MFN deals, what will happens when Trump leaves office? (Shutterstock) Key Takeaways If manufacturers try to opt out of some provisions in their Most Favored Nation deals after President Trump leaves office, the launch pricing commitment could be the hardest to undo.