Once again, Trump’s aggressive, scattershot use of executive power has pushed us into new constitutional territory.

A court fight over President Donald Trump’s decision to end a US policy that exempted small-value packages from China from tariffs is moving ahead over the administration’s opposition.A federal judge on Thursday denied the US Justice Department’s request to pause litigation over what’s known as the “de minimis” tariff exception while a broader fight over Trump’s move to raise global tariffs on imported goods is pending.

Here is some background on the court that made the May 28 decision to block a far-reaching tariff policy May 28.