The president can be replaced by Congress whenever they want. Refusal to fight a declared war would be more than enough reason.
So if a leftwing Democrat Congress declared war on free Poland and free Ukraine and if a Ronald Reagan type president refused to command the troops to invade Poland and Ukraine, do you actually think that Congress could justifiably impeach the President?
Look, I don't know where you got your GED, but your view that the Constitution means what you want it to mean, not what it clearly states, is what being leftwing is all about.
Cut the spam doofus, try thinking past your nose and answer the above question.
Let's take a real world hypothetical. If Roosevelt would have refused to wage war on Japan or Germany after the Declaration of War by the Congress, you bet he would have been impeached.