October 1, 2018, the USMCA text was published as an agreed-to document. Lighthizer credited Jared Kushner with architecting the deal and rescuing it several times from collapse. The agreed text of the agreement was signed by leaders of all three countries on November 30, 2018, as a side event to the 2018 G20 summit in Buenos Aires, Argentina. The English, Spanish, and French versions would be equally authentic, and the agreement would take effect after ratification from all three states through the passage of enabling legislation. U.S. Ambassador to Canada Kelly Craft played a leadership role in trade negotiations between the US and Canada, resulting in the signing of the new trade agreement. Her work in hammering out the trilateral agreement raised her stock with the Trump administration. It was later revealed in a memoir published by Stephen Schwarzman, the CEO and founder of American LBO specialist The Blackstone Group, that he had incited Justin Trudeau to concede the protected dairy market in the USMCA negotiations. According to Schwarzman, Trudeau feared that a recession would impact his government's prospects during the 2019 Canadian federal election. The executive, who had been retained by Trump, also was invited in January 2017 to address the Liberal Cabinet at a Calgary retreat when the Cabinet would be unprotected by its Privy Council Office civil servants. Then, as the negotiations reached their end on October 1, 2018 at a last-minute behind-the-scenes meeting at the United Nations in New York City, Trudeau sacrificed the dairy industry to save the media industry and the automotive exemption. Chrystia Freeland, the Foreign Affairs minister from Trinity-Spadina riding in downtown Toronto whose constituents include many staff of the CBC and The Globe and Mail and the Toronto Star and the Toronto Sun, maps "Canadian culture" directly onto the media industry. Robert Fife in an election cycle article failed to obtain any comment from other than the Liberal party. Fox News reported on December 9, 2019, that negotiators from the three countries reached an agreement on enforcement, paving the way for a final deal within 24 hours and ratification by all three parties before the end of the year. Mexico agreed to the enforcement of a minimum wage of US$16/hour for Mexican automotive workers by a "neutral" third party. Mexico, which imports all of its aluminum, also expressed opposition to provisions regarding American steel and aluminum contents in automobile components. Provisions