We used to say things like "unless you vote for/against x or y we won't vote for you or donate". That time has passed. It's over. They are done. Make sure they know.
https://www.senate.gov/senators/How_to_correspond_senators.htm
https://www.house.gov/representatives/find-your-representative
I wrote an email saying exactly that yesterday to the Colorado GOP. Told them their cowardly behavior was disgusting and shameful. I hoped for them to meet a traitors fate. Never another dime from me. Also changed party affiliation online to unaffiliated. Fuck them all.