From 1989 to early 2017, Sue Biniaz was the lead climate lawyer and a climate negotiator at the State Department. She was also a key architect of the Paris Agreement on Climate Change, a UN-negotiated agreement designed to mitigate global warming, which went into effect in November 2016. In June 2017, President Trump announced his intention to withdraw the United States from the agreement. Sue sat down with Lawfare's Jack Goldsmith to talk about the early days of U.S. and international climate action, how the Paris Agreement came into force and the predecessor agreements that gave rise to it, how it was supposed to operate, and what impacts Trump's actions have had on international climate policy.