Expected Taiwan visit of Nancy Pelosi threatens US-China relations

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.

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