What's behind Donald Trump's 'love affair' with tariffs?

Why does Donald Trump appear so determined to impose tariffs? Is it about raising revenue and bringing back jobs? Is it about leverage? To help us sort through what could be a complete overhaul of US and global trade policy of the past 75 years, Charles Pellegrin speaks to Greta Peisch, partner in international trade practice at law firm Wiley Rein and former general counsel at the office of the US Trade representative during the Joe Biden administration.