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 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.

In a move sending a strong signal to China, foreign ministers from Quad countries -- India, Australia, Japan and the United States -- in a joint statement on Tuesday strongly opposed any unilateral actions that seek to change the status quo by force or coercion.

In the first such meeting in US President Donald Trump’s second term, the foreign ministers of Quad member-states United States, India, Japan, and Australia met on the sidelines of the inauguration at

Australian Foreign Minister Penny Wong met her Indian and Japanese counterparts in Washington and said the invitation for Quad foreign ministers to attend President-elect Donald Trump's inauguration showed an "iron-clad commitment" to close cooperation in the Indo Pacific region.

Australia's Minister for Foreign Affairs, Penny Wong, has expressed happiness over the invitation extended to Foreign Ministers of India, US, Australia and Japan for inauguration of US President-elect Donald Trump and stressed that it demonstrates "collective commitment of all nations to Quad",