Allies start to question the US nuclear umbrella

Allies start to question the US nuclear umbrella

Lack of coherence in Trump’s policies raises risks of proliferation

Are we at the start of a new nuclear arms race?

Matthew Bunn, a professor specializing in nuclear arms control at Harvard's Kennedy School, tells NPR's Ayesha Rascoe about concerns over a new nuclear arms race as the U.S. looks increasingly inward.

The cooling in transatlantic relations, as well as Trump's support for Putin in the context of the war in Ukraine, have seriously undermined confidence in American commitments in Europe.