Politics: avoid or boundary

My MIL is coming to visit soon and we are on opposing sides of the political spectrum. She’s into the orange guy and tries to bring him up in general and to my husband frequently…stating things out loud that she’s happy that he’s done. While my husband doesn’t love the orange guy, he’s more of a moderate republican and can banter with her. I just start to feel my skin crawl when she says things that sound ignorant and small minded. It’s a trigger for me. How should I address this with my husband before she comes? How should i calmly address it when it comes out when she’s here? Positive, constructive ideas only please.