Am I misunderstanding, or are you suggesting that it would be exceptional for the U.S. to keep diplomatic negotiations private? ISTM that it's just the opposite

Am I misunderstanding, or are you suggesting that it would be exceptional for the U.S. to keep diplomatic negotiations private? ISTM that it's just the opposite: International discussions are almost always held in private. Why should what the USTR does be any different from, say, negotiation with an ally over a Status of Forces agreement?