IMO the Tariffs in this instance are introduced mostly to increase revenue. But, this method of collecting taxes is flawed because as you start producing more items domestically, your volume of imports drops and therefore tariff income will reduce and you don't want that. So sooner or later the US administration will realize that tariffs alone aren't going to fix their finances and they will have to increase income taxes or VAT. Best not to do tax cuts at all (even if they manage to get a budget surplus in a year's time because it will be temporary).
OOOOK here is a link. Crazy link? Peter Navarro Says Trump Tariffs Are ‘Biggest Tax Cut in American History’