Foreign policy is typically a general election trap for Democrats, but now it’s presenting a problem for some 2020 presidential candidates in the primary.

President Trump’s order to kill Iranian Revolutionary Guard Quds Force leader Gen. Qassem Soleimani on Iraqi soil has shifted the 2020 political landscape and left some Democrats in uncharted waters. While Joe Biden’s long foreign policy record is both an asset and a liability, the positions of comparatively untested top Democratic rivals such as Bernie Sanders, Elizabeth Warren, and Pete Buttigieg are now receiving greater scrutiny as the opening Iowa caucuses near on Feb. 3.