By RICARDO CASTILLO     At long last, we are beginning to hear  some of the details of the United States Mexico-Canada Agreement (USMCA) negotiations. According to Mexican President-elect Andrés Manuel López Obrador (AMLO), the toughest clause was on energy, which was almost a deal-breaker. After heavy disputes, that bickering President Donald Trump finally softened his stance and spoke over the phone to AMLO.