Hello everyone and welcome to Ammanpur. Here's what's coming up.

Trump's tariffs face the Supreme Court as the world braces for impact.

The Director General of the World Trade Organization speaks to Christian about navigating these turbulent times.

Then a record nearly 60,000 runners took part in New York City's marathon, including

elite runner and the Atlantic CEO, Nicholas Thompson.

I asked about his passion and his new book, The Running Ground.

Also ahead,

He's been able to exploit the grievances of working people who feel

elites look down and he goes after those elites. How Trump won over the working class, award-winning

Harvard professor Michael Sandell speaks to Michelle Martin about the deepening divide swaying blue collar support for MAGA.

Welcome to the program, everyone.

I'm Biana Golodrigo in New York, sitting in for Christian Amonpour.

We begin with Donald Trump's tariff war, which lands in court this week, facing its biggest challenge yet.

The Supreme Court will hear arguments challenging the legality of many of his administration's tariffs,

a move that could upend his entire trade agenda and also decide the limits of a president's power.

Relying on a 1970s-era emergency law, Trump has pushed import tax rates as high as 50% on key trading partners,

including India and Brazil, and as high as 145% on China earlier this year.

At stake are almost $90 billion in revenue that the administration has already collected and potentially trillions more.

Trump has been warning that ruling against him would endanger national security and create what he calls a financial mess.

I will tell you that's one of the most important cases in the history of our country,

because if we don't win that case, we will be a weakened, troubled financial mess for many, many years to come.

The World Trade Organization is paying very close attention to this legal challenge,

...