Democrats want to challenge Trump’s foreign policy in 2020. They’re still working out how.

The push for a progressive foreign policy, explained.

President Donald Trump is heading into the 2020 election with a pretty solid foreign policy success story to sell American voters — and Democrats are struggling (but working) to come up with a coherent message to counter it.

In just two years in office, Trump has achieved several big foreign policy wins: ISIS’s caliphate has been completely defeated. North Korea hasn’t tested a nuclear bomb or ballistic missile since 2017. The US defense budget has grown to historically high levels. And Mexico...