In the short term: fear of reprisals from Trump, as he clearly warned them not to raise prices. In the long term markets find a new equilibrium, as they always do when a new tax is imposed, and that is probably going to be a combination of lower margins, higher prices for the consumer and lower prices for foreign suppliers.

"higher prices for the consumer" can include lower value at the same price. Size reduction seems a common method for certain commodities. This may result in reduced consumption (e.g., a consumer buying one package of ice cream every other week), as well as increase customer dissatisfaction when the change is noticed, and it can increase packaging cost per unit weight/volume.

Other ways of reducing value are possible such as reducing quality control effort, reducing quality of inputs, and reducing manufacturing costs in ways that are known to reduce product quality.

Pushing costs to effectively underregulated externalities can also avoid price increases.

It is also sometimes possible to increase efficiency. Even a long term commodity can have potential for efficiency improvements that were considered not worth exploring under stable pricing pressures. (I suspect value reduction is easier and much faster than efficiency improvement.)

Sadly, reducing value can have a disproportionate cost to consumers. Reducing manufacturing costs for a Watchman's boots by 20% may reduce the lifetime of such by 30% and reduce the quality of use by 50% (which may be related to Samuel Vimes' theory: https://en.m.wikipedia.org/wiki/Boots_theory ).

> fear of reprisals from Trump

Realistically, what's he gonna do? Shut down the company, which he oh so desperatly wants in the US? Tax them more, driving their cost up more?