I think we should go through with the full F-35 purchase and any other projects underway or contracted.
There's less than 211 weeks until Trump's gone, the last of Canada's F-35 probably won't be delivered until afterwards. It's a thirty plus year commitment, POTUS47 through 50 will be long gone.
en.wikipedia.org
But for future projects we should avoid US firms unless we have no better options.