I don't know why you're getting downvoted, this is the real reason.
In the wake of 9/11, Congress issued a broad, many would say overly broad, Authorization for the Use of Military Force that basically granted the Office of the President open-ended permission for any conceivable martial escapade he might want in the Middle East. Every President of the 21st century has used this as the legal justification for meting destruction onto that part of the world: for the wars in Iraq and Afghanistan, bombings in Syria, Libya, Somalia, Yemen, and Pakistan, as well as our little-publicized offensive in Northeast Africa.
Due to this, what Trump did is legal. Unfortunately it seems people just want to shoot the messenger now if they say something they disagree with, even if they're correct.
I 100% support removing Trump from power through impeachment and absolutely think he's a threat to democracy, but throwing bullshit articles of impeachment at him over and over just galvanizes his base when he continually shrugs them off.
If we ever have another elected president, I hope that one of their first acts after undoing literally everything that the orange menace has done is to replace every picture of trump in any government building with this.