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  1. Violating the Constitution by Waging War Without Congressional Authorization Multiple legal experts cited in Slate argue that Trump’s initiation of a full-scale war with Iran—openly described by him as a “war”—occurred without any congressional authorization, violating Article I of the Constitution, which vests the power to declare war in Congress.
  1. Escalating a “Devastating, Illegal War” and Ignoring International Humanitarian Law Members of Congress have publicly stated that Trump’s actions constitute an illegal war and involve threats of massive war crimes, including targeting civilian infrastructure.
  • Rep. Yassamin Ansari said Trump is “escalating a devastating, illegal war, threatening massive war crimes and targeting civilian infrastructure in Iran.”
  • Reporting notes that Trump threatened to destroy every bridge, power plant, and major infrastructure site in Iran, which lawmakers argue would violate the laws of war.
  1. Ordering or Enabling Strikes on Civilian Targets (Potential War Crimes) Articles report that U.S. strikes under Trump’s direction have hit:
  1. Publicly Threatening Annihilation of an Entire Country’s Infrastructure Trump’s statements—such as threatening that Iran could be “taken out in one night”—are cited by lawmakers as evidence of reckless, unconstitutional, and unlawful conduct.
  • Ansari described these threats as “a monstrous war crime” and grounds for impeachment.
  1. Acting Outside Constitutional Limits and Claiming Unlimited Executive War Powers Legal scholars interviewed by Slate argue that Trump’s assertion of unilateral authority to wage a prolonged war represents:
  • A “dictatorial” theory of executive power,
  • A total inversion of constitutional design,
  • An impeachable abuse of office. These arguments come from constitutional law experts analyzing Trump’s Iran actions.
  1. Endangering U.S. Service Members Through Reckless Escalation Members of Congress argue that Trump’s actions recklessly endanger U.S. troops by provoking a major conflict without legal authority or strategic justification.
  • Rep. Ansari stated that Trump’s escalation “endangers U.S. servicemembers” and violates his oath.
  1. Ignoring Cabinet Warnings and Exhibiting “Deranged” Decision-Making About War Some lawmakers have argued that Trump’s public statements about the Iran conflict demonstrate an inability to faithfully execute the duties of the presidency.
  • Reporting notes calls for the 25th Amendment due to Trump’s “deranged statements” about the war. While the 25th Amendment is distinct from impeachment, the same conduct is cited as evidence of unfitness and abuse of power.