WASHINGTON - President Joe Biden met virtually Monday with Mexican President Andrés Manuel López Obrador — a chance for the pair to talk more fully about migration, confronting the coronavirus and cooperating on economic and national security issues."This is what I know, the United States and Mexico are stronger when we stand together," Biden told López Obrador at the outset of the meeting, alluding to past differences between the two countries. "We’re safer when we work together.