By David Brunnstrom, Simon Lewis and Alasdair Pal WASHINGTON (Reuters) - The United States, Australia, India and Japan recommitted to working together on Tuesday, after the first meeting of the China-focused "Quad" grouping's top diplomats since President Donald Trump returned to the White House.

On his first full day as U.S. secretary of State, Marco Rubio is meeting with his counterparts from Australia, India and Japan. The four countries are known as the Quad.

Donald Trump’s criticism of China on the campaign trail and after his election had raised the specter that Day 1 of his second presidency would reignite a trade war between the world’s two largest economies.

Among Trump's first acts in office on Monday was to order U.S.'s exit from the World Health Organization and Paris Agreement.