> to force/encourage the manufacturing of goods in the US, rather than importing them.

There are two mutually exclusive stated goals. One is, as you said, onshoring tech manufacturing to the USA [1]. The other stated goal is to eliminate income tax and replace it with income from tariffs [2][3]. To play these out on their own terms: if the first goal succeeds, then import volume would drop, and total tariff income would be too low to replace income taxes. If the first goal fails, then tariff income would be high enough to replace income taxes. IDK I haven't done the napkin math and I suspect neither have they.

[1]: https://www.foxbusiness.com/politics/trump-says-his-tariffs-...

[2]: https://www.foxbusiness.com/media/trump-proposes-abolishment...

[3]: https://www.foxbusiness.com/video/6371514396112

Going with Fox Business links to avoid accusations of bias.