The charges have not yet been dismissed. No one has agreed to dismiss them. (Some even quit:
Justice Department Officials Resign in Protest Over ‘Quid Pro Quo’
https://nymag.com/intelligencer/article/doj-officials-fall-on-sword-instead-of-dropping-adams-case.html )

If they are dismissed without prejudice, they can be dismissed at any time.

That leaves a lot of leverage.