I think it's still important to call both them, and your Republican reps. They keep track of how many people call on issues, and what side they take. I think a lot of reps are worried about retaliation from the POTUS, and the only thing that gives them ammunition is constituents on their side.
As they should be, everyone from the GOP who has ever crossed the golden boy was destroyed by him. And now he has the richest man in the world to finance a campaign to destroy them.
The constituents matter far less to them than those two things. They made a Faustian bargain, and they care about keeping their jobs, which means doing what he tells them, not what you tell them.
Being HK real estate tycoons, they just shrugged, and sued him back, and won, since Chuangpu's lawyers are never really the brightest of the bunch. Won total ownership of the project AND the right to use his name...