Trump has declared wars on small boats in international waters in the Caribbean and the Pacific, claiming that they are drug boats, without proof, claiming a right to kill the people on them, contrary to international law.
Trump invaded Venezuela and seized its leader.
Trump has involved U.S. military forces in striking a Mexican cartel chief, leading to a bloodbath there.
Trump has unilaterally made strikes on Iran.
Trump has now deployed the U.S. military in Ecuador.
Trump deployed the National Guard to peaceful American cities.
Trump has deployed ICE as his private secret police to lawlessly terrorize American cities with scant regard to what they are actually legally authorized to do.
Trump has deployed U.S. forces to interdict Russia's shadow fleet of oil tankers trying to evade sanctions arising out of the Ukraine War. The Ukraine war itself is ongoing and Trump and blown hot and cold on it, prolonging the war by giving Putin hope.
Trump has threatened, but not yet struck, Greenland, Canada, and Panama.
And, while only metaphorical, Trump has declared trade wars on the entire world.
In most of these cases, Trump hasn't had even a whisper of Congressional authorization or legal authorization to act. The uses of force (and the tariffs) have violated domestic and international law.