Trump endorsed Oz because they’re both celebrities.
1. Among all the candidates in the race, he (Oz) stands the best chance of winning in November.
2. The Pennsylvania GOP is a clown show, and Trump wants to screw them for their lack of support before the 2020 election by endorsing an outsider who has no political ties to the state.
Dr Odd was Meliana’s pick. She is great friends with that nutball.