Ironically, the UK has a defacto king and the USA does not, Trump doesn't have the power to do the majority of things which get talked about in the news from defining citizenship to war to creation of government offices. The only reason this shit is happening is because of Republican trifecta and a stacked supreme court. If even one part of congress weren't GOP controlled then the whole multiple fiascos would never have been funded, and this is demonstrated by the fact that DHS and then just ICE went without funding until the GOP passed a reconciliation budget with simply majorities in the house and senate.