As for the Panama Canal, Mulino denied U.S. vessels are being overcharged to use the waterway and emphasized that China plays no role in the canal. A Hong Kong-based firm manages two ports at the Panama Canal’s entrances, but Panama owns and operates the entire canal.

Treaties ratified by the Senate in 1978 established permanent neutrality, but some Republicans regret that decision.

As Trump targets Panama with needlessly caustic bombast, he's chosen a would-be ambassador who might not be especially well suited for a job in diplomacy.