David Frum had a front-row seat the last time America went to war against a Middle Eastern adversary. He was in the George W. Bush administration in the lead-up to the Iraq War. In fact, as one of Bush's speechwriters, he wrote the line that came to define American foreign policy for the first decade of the 21st century. Four months after the World Trade Center towers were turned to rubble, President Bush channelled Frum in his State of the Union speech, saying that rogue states which harbored, financed and aided terrorists -- like North Korea, Iraq and Iran -- "constitute an axis of evil, arming to threaten the peace of the world."

This idea, of America being at war with an alliance of dangerous terrorist states, provided the rationale for going to war with one of them, Iraq. In fact, David Frum went on to write a book in 2004 with a fellow neoconservative, Richard Perle, a chief architect of the Iraq War, entitled "An End to Evil: How to Win the War on Terror". It became a bible of neoconservative foreign policy, in which Frum and Perle argued, among other things, for taking immediate, decisive action against Iran.

Fast-forward 22 years and David Frum is one of the most prominent and persuasive conservative voices against Donald Trump. He has written two anti-Trump books, "Trumpocracy: The Corruption of the American Republic", and "Trumpocalypse: Restoring American Democracy". He's a staff writer at The Atlantic and the host of the podcast The David Frum Show. And since the invasion of Iraq, his view of American power has grown more nuanced.

David joins Josh to explain the precarious position in which war with Iran puts not just the Middle East... but American democracy itself.