The president who cried tariffs: will the US supreme court challenge Trump’s trade war?

The US high court will hear arguments on whether Trump's erratic imposition of global tariffs is legally valid

Donald Trump thrives on emergencies. He cried havoc on the very first day of his second term, declaring a national emergency caused by an invasion" of illegal aliens" from Mexico. He has since invoked emergencies more than any president since the passage of the National Emergencies Act in 1976.

Next Wednesday, he faces another of his own making, as the US supreme court hears oral arguments on whether his globe-shaking signature economic policy - tariffs - is legally valid.