Donald Trump is threatening to invade Greenland. What once sounded like an unhinged fixation has escalated into explicit threats of military force against a peaceful U.S. ally — and Congress must shut it down before Trump drags the country into another reckless conflict. This danger is not theoretical. After Trump attacked Venezuela without congressional authorization, he immediately ramped up his rhetoric about using force to seize Greenland next. Once again, Trump is signaling that he believes the U.S. military exists to serve his personal ambitions, not the Constitution or international law. That’s why Senator Ruben Gallego has introduced an amendment to explicitly block Trump from using military force against Greenland without congressional approval. The amendment reasserts a basic constitutional principle that Trump keeps trying to erase: presidents do not get to start wars on their own. Congress alone has the authority to authorize military force, and it must use that power now. Trump has already shown a willingness to bypass Congress, ignore allies, and gamble with global stability for political spectacle. As Common Dreams reports, lawmakers and national security experts warn that Trump’s obsession with Greenland risks triggering an unlawful conflict that would fracture NATO, destabilize international alliances, and put U.S. service members directly in harm’s way for no legitimate reason. Politico reports that Congress is now openly debating war powers in response to Trump’s escalating threats. That debate cannot end in half-measures or silence. If Congress fails to act, Trump will treat that inaction as a green light. Blocking Trump from attacking Greenland is about stopping the normalization of presidential war threats. It’s about preventing the U.S. military from being used as a tool of intimidation and conquest. And it’s about defending democratic accountability against an executive who has repeatedly tested — and violated — constitutional limits. Tell Congress to support Senator Gallego’s amendment and block Trump from using military force against Greenland. Uphold the Constitution. Protect peace. Stop this reckless threat now, before it becomes an irreversible disaster. The petition to Congress reads: “Block Donald Trump from using military force against Greenland. Uphold the Constitution and stop an unauthorized war.”