Politics stops at the water’s edge? Not recently

In the Washington Post, AHS speaker and Georgetown Professor Robert Lieber questions whether polarization in domestic politics affects foreign policy:

"With the passage of time, and especially if results fall short of initial expectations, party differences over foreign policy tend to widen, both because of disagreements over the issues at stake and as a result of elite leadership. In today’s polarized climate, politics can be delayed at the water’s edge, but it certainly doesn’t stop for long."