On his first full day as secretary of state, Marco Rubio is meeting with his counterparts from a group of countries known as the Quad: the United States plus India, Japan and Australia, representing nearly 2 billion people and more than a third of global GDP.

Newly sworn-in Secretary of State Marco Rubio is hitting the ground running Tuesday with meetings with his counterparts in the Quadrilateral Security Dialogue, known as the Quad, which includes India,