There are 4 possible solutions to this problem;
a) convince Americans that it's worth paying more for a locally built product. This is the simplest approach, but there's only so much margin here that the consumer will tolerate. At the moment this gap is too large.
b) Tariff foreign imports to raise their cost. So the US consumer pays more, whether they like it or not.
c) subsidize local production out of the "national interest to support this industry" budget. This has the effect of ramping up demand, hence production, hence production being developed, and eventually getting cheaper.
d) improve US products, and prices, so that they compete in price to the import - or at least fall inside the margins such that a) becomes effective. c) can help bridge the gap here until the US companies have caught up.
In the long run, not all these strategies win. If you go the tariff route, then it's hard to undo it later. Local products fall behind, and the harder it becomes to catch up. Not impossible, but hard.
If Ford wanted tarrifs to help boost EV demand, and so allow Ford to build out infrastructure and lower costs, then fine. But it seems it's more of a short term play to just keep ICE Fords selling in the short term.
This is one of those "the internet is a fad, it'll never catch on" moments. EV's are here to stay. They're going to win. That's pretty obvious to anyone paying attention. If the question is "how to maintain the US car production" then they should be all-in on EV development now. It seems to me though that the current strategy seems to be very short term thinking - trying to just hold back the tide.