Hong Kong pro-democracy leaders in the United States on Tuesday shadowed the start of Chinese President Xi Jinping's state visit, but they failed to secure top White House meetings as they seek to pressure Beijing to honor governance agreements.

Veteran democracy advocate Martin Lee, 77, and student leader Joshua Wong, 18, are using the one-year anniversary of the mass democracy protests that clogged the Asian financial hub for 79 days to get Washington to push Xi on democratic reform.

However, their attempts to meet with top White House officials failed, Lee told Reuters in an interview in New York.