What provides the best evidence that the gulf of tonkin resolution was unconstitutional? a) president lyndon johnson faced impeachment proceedings because of its passage. b) it was declared unconstitutional in the landmark case c. turner joy v. the united states. c) college students across the nation staged "sit-in" protests to demonstrate against the resolution. d) it was replaced in 1973 by the war powers act, which placed limits on the president's power to wage war.