He didn’t vote for President Trump. He said so on Tucker Carlson the other day.
I didn’t watch the interview.
He said he DID vote for trump. Google will do it for you
https://www.google.com/#q=caitlyn+jenner+vote+trump
... and, if you need more;
The Tucker Carlson Show. At the TWELVE SECOND mark .... :12 second, Caitlin tells Tucker she voted for Trump.
https://www.youtube.com/watch?v=STu0RgYE0jc