Taiwan's top representative in the United States met privately in Washington this month with a little-known group of intelligence advisers that officials say has emerged as a key power node in U.S. President Donald Trump's White House.

The meeting with Alexander Yui, Taiwan's de facto U.S. ambassador, was described by two sources with knowledge of the matter and amounted to one of the higher-level Taiwan-U.S. contacts to date during Trump's second term.

It was also an unusually sensitive meeting for the previously obscure group, the President's Intelligence Advisory Board, which includes members who have jobs outside of the federal government and has historically played a low-key role in policymaking.