On “Face the Nation,” Mexican Ambassador to the U.S. Martha Bárcena Coqui wouldn’t confirm President Trump’s claim that the Mexican government will buy agricultural products from the U.S. as part of the neighboring nations’ new deal. This comes after The New York Times reported that in March, Mexico had agreed to deploy forces to its southern border. Washington Post reporter David Nakamura joins CBSN to discuss lingering questions surrounding the deal. Source