WASHINGTON _ From day one, President Donald Trump has imposed his will on talks to overhaul the North American Free Trade Agreement. But as his administration tries to seal the deal, it's not clear he holds all the cards.
Trump's repeated threats to pull out of the pact have kept Mexico and Canada on their heels. The president may still brandish the threat of withdrawal to push a deal through Congress.
Yet Canada does have some leverage as it decides whether to join a tentative U.S. deal with Mexico. Meanwhile, any deal Trump signs then requires congressional approval, and the Democrats are favored to seize control of the House in November, making approval far from a foregone conclusion.
Here are three ways to think about the power dynamics in the NAFTA renegotiation:
