Obviously it would need done via Congress. However, the assumption that it would create an unstable business environment can be addressed by doing just one thing in addition to the tariffs: reducing regulation and onerous bureaucratic "hoops" most American businesses tend to have to jump through. The tariffs, combined with relaxed regulation/taxation of American business, would create the perfect pro-business environment.
and the fact is that much can be accomplished by “jawboning” or the threat of action knowing that Trump has the guts and support of Congress to actually follow through on his threats if voluntary compliance is not forthcoming. It comes down to having the right prioriites to know where to focus (which Trump has already done) and the knowledge of business and economics to be credible. Once he proves that he can (and will) do what he says, all we are going to hear is a great scurrying sound of companies moving quickly into compliance and taking advantage of the growth climate that will follow.
That could happen pretty quickly. The new administration could announce a total review of ALL regulations on Constitutional and on economic grounds.
• The review would be undertaken by newly appointed boards within each agency.
• Promulgation of all new regulations would cease.
• The current regulation-writers would be tasked with new, unrelated but very menial responsibilities (realizing government unions would frown on mass firings)
• If new regulation-writers are needed, they would be hired from outside the government.
• A bill would be submitted rescinding the ability of extremist interest groups to bring lawsuits on behalf of plants, animals and other non-human parties.
Give companies two years. If they don’t change how they do business, the tariff is applied. That’s incentive.