President Trump’s reasons for wanting control of the Panama Canal can be found at either end of the interoceanic waterway.Every day, dozens of cargo ships pass by blue cranes at a port near the Pacific Ocean entrance,

Panama has rejected president-elect's threats, but Hong Kong and mainland Chinese companies have much at stake President-elect Donald Trump's threat to retake the Panama Canal to safeguard US national security has raised questions about the possible impact on Hong Kong and mainland Chinese companies operating there.