Expected Taiwan visit of Nancy Pelosi threatens US-China relations

U.S. House Speaker Nancy Pelosi, left, and Prime Minister Lee Hsien Loong shake hands in Singapore at the start of her Asian tour Source: AAP / Mohd Fyrol/Official Photographer/MCI/AP

It's a move China has warned will come with dire consequences for the U-S, but the White House says it refuses to be intimidated.

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