The official noted that the Quad met at foreign minister level under the previous administration of Donald Trump, who is running against Vice President Kamala Harris in November, andenjoyed bipartisan support, as reflected by the formation of a congressional Quad Caucus ahead of the summit.

Senior Biden administration officials told reporters ahead of the meeting that the leaders would announce plans to expand an Indo-Pacific Partnership for Maritime Domain Awareness, launched two years ago to include the Indian Ocean region.

By Trevor Hunnicutt WASHINGTON (Reuters) -Tensions brewing in Asia's trade-rich waters top the agenda as U.S. President Joe Biden welcomes leaders from Australia, India and Japan to his Delaware hometown for a diplomatic push to counter China in the waning months of his presidency.