Every president since Nixon, whether Democrat or Republican, has dismissed the War Powers Resolution as unconstitutional. In 1999, President Clinton undertook military action to stop the mass murders of Serbian dictator Slobodan Milošević. In 2011, President Obama deployed the military to take out Libyan autocrat Muammar Gaddafi.
In both cases, members of Congress sued, claiming violations of the War Powers Resolution. In both cases, they lost. Now, having learned nothing, members of Congress are threatening to do the same thing to President Trump.