This definitely seems to be an application of the adage

"If your only tool is a hammer, every problem looks like a nail"

It's not like there's much of a domestic coffee industry that would benefit anyway, aside from a few growers in Hawaii. Also coffee trees take 5 years to start bearing fruit and by then Trump's temper tantrum, (and his presidency), will be over.

Cut flowers, on the other hand, were not always grown abroad, so a protectionist policy could in theory revive the industry. However it would have to be thoughtfully and consistently applied and just biased on day-to-day caprice.