President Donald Trump visits the Forbidden City with China's President Xi Jinping in Beijing on November 8, 2017. Jonathan Ernst | Reuters

President Donald Trump's commitment to work toward a sweeping trade deal with China in the next three months sets up a pivotal stretch for one of his top campaign goals: reshaping U.S. trade relationships around the globe. The Trump administration and the Chinese government agreed to a temporary trade truce Saturday night, pledging to delay threatened tariffs for 90 days while they work toward a concrete trade deal. (Top Trump economic advisor Larry Kudlow told reporters Monday that the 90-day timetable will start Jan. 1, but the White House later issued a correction saying the timetable starts December 1.) Washington will push Beijing to address thorny issues such as forced technology transfers and alleged intellectual property theft — which the two sides have failed to resolve despite months of attempts. The commitment to talk throws Trump into the most high-stakes period yet in his yearslong effort to crack down on what he calls unfair trade practices. At the same time as the China talks play out, the president will try to push his revision of the North American Free Trade Agreement through a skeptical and divided Congress. Trump is eager to declare victory on trade after arguing as a candidate and in the White House that China's practices and the pact with Canada and Mexico punished American workers. But to do so, the volatile president will have to navigate delicate talks on two fronts. Failure in either effort could upend U.S. relationships with its three largest trading partners and shake the American and global economies.

Trump showed optimism Monday morning about breaking the impasse with China. In a tweet, he called his meeting with Chinese President Xi Jinping at the G-20 summit in Argentina "extraordinary." He promised "very good things will happen." "We are dealing from great strength, but China likewise has much to gain if and when a deal is completed," he wrote. Trump tweet Trump moved to declare victory after Washington and Beijing paused a trade war that has led to tariffs on more than $350 billion in Chinese and U.S. goods combined. In separate tweets Monday, he said China has "agreed to reduce and remove" a 40 percent tariff on U.S. car imports and "immediately" purchase more U.S. agricultural products. Treasury Secretary Steven Mnuchin — part of the delegation that met with Chinese officials this weekend — echoed the president's optimism on Monday. "This is the first time that we have a commitment from them that this will be a real agreement," he told CNBC's "Squawk Box." "I'm very hopeful we can turn this into a real agreement." Still, challenges await the Trump administration in all of its trade talks. Competing interests will potentially emerge on the China negotiating team. Mnuchin said Trump himself will lead the talks, but they will include U.S. Trade Representative Robert Lighthizer, Commerce Secretary Wilbur Ross and trade advisor Peter Navarro. Mnuchin's description contradicts an earlier statement from Navarro, who said Lighthizer would head the negotiations. Navarro, who among Trump's advisors has called for the most forceful approach to China, called Lighthizer "the toughest negotiator we've ever had at the USTR." Lighthizer is also known to take a harsher line on China. After Mnuchin's and Navarro's remarks, The Wall Street Journal reported, citing sources, that Trump told Xi that Lighthizer would run the negotiations between the two countries. Monday afternoon, Kudlow confirmed that Lighthizer would be leading the talks, after earlier playing up the notion that it would be more of a team effort.