Improper ascendant

https://t.co/yvw1dPCk1a #hamiltonelectors Federalist 68: "the desire in foreign powers to gain an improper ascendant in our councils."

— Kenneth Silber (@kennethsilber) December 10, 2016

This clearly fits the bill, as described in Federalist 68. And it's far from the only reason the electors should act.