tough trade tactics for the successful renegotiation of nafta, but how different is this new nafta? chief business correspondent christine romans is in our money center with the answer. new and improved? >> it has a new name, the president rebranding nafta as the united states-mexico-canada agreement and he says it never would have happened without his trade threats. >> by the way, without tariffs we wouldn't be talking about a deal, just for those babies out there that keep talking about tariffs, that includes congress. oh, please don't charge tariffs. without tariffs you wouldn't be -- we wouldn't be standing here. >> trump promised to use tariffs to force out trade deals like with china. he calls the usmca a brand-new deal but it's a nafta modernizati modernization. it addresses business that is didn't exist in 1984, it's stronger on intellectual property. other big changes, benefits for u.s. wheat farmers, more access to canada's protected dairy market, that's a relatively