Trump’s unlawful strikes on Iran have laid bare the absence of any effective legal constraints on a U.S. president to use deadly force in the world.

Democrats stress that only US Congress – not the president – has the authority to take the country to war.

Trump’s unlawful strikes on Iran have laid bare the absence of any effective legal constraints on a U.S. president to use deadly force in the world.

Some lawmakers have called Trump's strikes on Iran "unconstitutional" - so did he have the authority to order them?