No TRUE Christian...
Have you heard of the "No True Scotsman" fallacy? It's a way of making your viewpoint invincible by moving the goalposts of your position. "No Scotsman puts sugar in their coffee." "But Angus puts sugar in his coffee." "Yeah, but no TRUE Scotsman..."
I hope one day we can move past the "No true Christian..." kind of thinking that needlessly separates and divides the Church. When we drive wedges between our fellow believers over matters of conscience, we "destroy the work of God" (Romans 14:20).
There are (obviously) strong feelings on who to vote for up and down the ballot. But "No true Christian..." statements are not a beginning point for discussion, empathy, and understanding or for living peaceably with others.
Below are a few links to some faithful, thoughtful Christians who are pushing back against the plurality of white evangelicals who voted for President Trump in 2016. I post this both for those who were told that being Christian must voting Republican (it doesn't have to); and for those Christians who might feel shame for voting not-Republican to know that you're not alone.
I would encourage you to not respond with immediate judgment ("Well, no TRUE Christian..."), but rather with curiosity.