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.

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.