A flood of presidential trade policy announcements has kept US automakers on edge since Donald Trump returned to the White House last month. While some signature threats –- like 25 percent tariffs on Mexico and Canada -- have been wielded and then paused,

The biggest foreign supplier of cars was Mexico ($49 billion), followed by Japan ($40 billion), South Korea ($37 billion), Canada ($28 billion) and Germany ($25 billion).

President Trump on Thursday signed a presidential memorandum proposing reciprocal tariffs that he maintains will crack down on unfair and discriminatory tariffs from both adversaries and allies.