Rubio called China the "most potent, dangerous adversary" during his confirmation and is expected to work with India, Japan, and Australia to counter this.

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,