With President Donald Trump’s second term, the debate over the use of tariffs is making headlines. On his first day in office Trump once again raised the prospect of the strategic use of these tariffs: he threatened to impose them unless partner countries (Mexico, Canada or the EU) introduced changes in their trade policies or made concessions in other domains (China with TikTok). This approach is likely to have profound implications for both the US as well as on the global economy for three key reasons. First, it will impact the already strained multilateral trading system. Second, there are direct consequences of US tariffs on individual partner countries. Third, there is the question of how effective such actions will be for the US, and that will also depend on the extent of any retaliatory measures. The UK-U.S. Trade Relationship Trump has threatened to impose sweeping tariffs—ranging from 10% to 20% on all trading partners, and up to 60% on Chinese imports. These statements clearly cover a multitude of possibilities, and this generates considerable uncertainty. The UK government appears hopeful that as the US does not have a trade deficit with the UK, that the UK may not be targeted. However, [...]