Best we've got is "resign in protest."

There's been a bit of it lately: 8 of the 28-person National Infrastructure Advisory Council (NIAC), all 17 members of the Presidential Committee on the Arts and Humanities, co-chairs of the Sustainable and Healthy Communities Subcommittee of the EPA, 5 members of Trump's business advisory council, 6 members of the Presidential Advisory Council on HIV/AIDS, the State Department science envoy...

(I haven't been keeping track, this was just a quick google search; probably there are more I missed. Not to mention the wave of early retirements, lateral moves to private sector, sudden new desires to spend more time with family, etc)