Should the US president have authority to override allied governments in peace negotiations?

Context

Presidential authority in peace negotiations raises fundamental questions about sovereignty, alliance management, and democratic accountability. When the US president negotiates on behalf of allied nations—or seeks to override their preferences—it touches on whether America should act as a unilateral superpower or respect the autonomy of partner governments. This tension has intensified as the US navigates complex conflicts involving multiple allies with competing interests, from Ukraine to the Middle East.