Volcker has recounted an incident in which he more or less walked out of a White House meeting with Reagan and James Baker, after Baker tried to order him to lower the discount rate.

https://www.businessinsider.com/ronald-reagan-fed-chair-volc...

Volcker also recalled telling Carter during his interview for the job that yes, he could stop inflation -- but then Carter would not be re-elected. Carter's reply was "Do it anyway."