The G20 summit comes amid tensions over trade, climate, and refugee policy and increased uncertainty over the U.S. commitment to multilateral institutions.

Taiwan has the potential to be a flash point in U.S.-China relations. U.S. House Speaker Nancy Pelosi’s trip to Taipei in 2022 heightened tensions.

International efforts, such as the Paris Agreement, aim to reduce greenhouse gas emissions. But experts say countries aren’t doing enough to limit dangerous global warming.

Modern vice presidents can trace much of their political influence to the broad reforms that Jimmy Carter and Walter Mondale made to the second-highest elected office in the late 1970s.