Why Trump's comment on discussing Taiwan arms sales with China has raised concerns

U.S. President Donald Trump says he is discussing potential arms sales to Taiwan with Chinese President Xi Jinping, and that has raised concerns. The island democracy relies on U.S. backing in the face of China’s territorial claims. Trump's comment over the weekend prompted some experts to say it might violate decades-old foreign policy principles defining the U.S. relationship with self-ruled Taiwan. Experts say Trump's comments may be creating a “dangerous precedent” allowing for Beijing to make demands regarding U.S. arms sales to Taiwan. Trump says he plans to visit China in April.