Patrick Chovanec
Legally, yes, there is something wrong with "engaging in diplomacy" if you don't hold office, if that's really what you're doing.
Republican Accountability
JD Vance on Bob Woodward's reporting that Trump has had as many as 7 calls with Putin since he left office: “Even if it's true, is there something wrong with speaking to world leaders? No. Is there anything wrong with engaging in diplomacy?”