Amy Martinez

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If the court sides with the Trump administration, it would mean presidents could fire heads of independent agencies would a ruling like this destabilize the federal government.

And Ukraine's president is in London today to meet with the leaders of Britain, France and Germany.

Europe is pushing back against some concessions in President Trump's peace plan.

But how much influence do they actually have?

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The Supreme Court will hear oral arguments today in a case that could vastly expand the president's power and erode the power of some regulatory agencies.

NPR's Andrew Hsu is here to explain.

So big day in court, Andrea.

Tell us what this case is all about.

Okay, and the president didn't accuse Slaughter of any of these things.

I did some quick math, Andrea.

That was 90 years ago, that case, that 1935 case.

So why is it being debated all over again now?

I think the removal protections have been unconstitutional from the beginning.

I don't think there is such a thing as an independent agency.