Are doctors allowed to discriminate against you because of your political views?

My doctor found me on Facebook. (Creepy, right?!) and discovered that I am a conservative, and that I support Trump's immigration order and am pro-life.
Now I know many of you don't agree, and that's fine. That's not what this is about.
My doctor, who has been treating me for months, told me that she won't treat me anymore BECAUSE I am a Trump supporter and then said she found me on Facebook (WHAT THE ACTUAL FUCK)
Is this even legal?

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