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, Trump’s multi pronged assault on the international trade order is building up incremental cost pressures, according to auto industry experts.

An additional 10 percent tariff on imports from China — a major auto parts supplier — has already been imposed, and a 25 percent tariff on steel and aluminum imports that takes effect from March 12 is likely to add another layer to supply and manufacturing costs.

Last Thursday, when Trump signed plans for sweeping “reciprocal tariffs” with trading partners, he highlighted an imbalance between US and European Union levies on car imports as a prime example of what he was targeting.

And the following day, the president said he planned to unveil tariffs on foreign cars in early April, though he did not specify how large the levies would be or which countries would be initially earmarked.