The biggest threat is,
Former Rep. John Delaney: "Well, the biggest geopolitical challenge is China, but the biggest geopolitical threat is nuclear weapons."
Gov. Jay Inslee: "The biggest threat to the security of the United States is Donald Trump, and there's no question."
Rep. Tulsi Gabbard of Hawaii: "The greatest threat that we face is the fact that we are at a greater risk of nuclear war today than ever before in history."
Sen. Amy Klobuchar of Minnesota: "Two threats: economic threat, China, but our major threat right now is what's going on in the mid-east with Iran if we don't get our act together with this president."
Former Rep. Beto O'Rourke: "Our existential threat right now is climate change. we have to confront it before it's too late."
Sen. Elizabeth Warren of Massachusetts: "Climate change."
Sen. Cory Booker of New Jersey: "Nuclear proliferation and climate change."
Former Housing and Urban Development Secretary Julián Castro: "China and climate change."
Rep. Tim Ryan of Ohio: "China without a question, they're wiping us around the world, economically."
New York City Mayor Bill de Blasio: "Russia, because they're trying to undermine our democracy and they've been doing a pretty damn good job of it, and we need to stop them."
Climate change seems to be a theme, agreed. Trump was mentioned Jay Inslee. lol. China, interesting. Semiconductors have been a thing with China. Nuclear proliferation is also a thing.
https://www.businessinsider.de/2020-democratic-debate-responses-us-biggest-geopolitical-threat-2019-6?r=US&IR=T