This would be an executive agreement, not a treaty.

这可能是一份行政协议，不是协定。

Without congressional approval, the letter said, the agreement would be only an executive agreement.

如果没有国会批准，这项协定就只能是一项行政协定。

It said that the next U.S. president " could revoke such an executive agreement" and " future Congresses could modify the terms of the agreement at any time."

这封公开信表示，“下任美国总统可以撤销这类行政协定”，“未来的国会可以在任何时间修改协定条款”。