Trump has openly admitted giving money to candidates in return for "favors". So the whole "pay-to-play" issue is not open to debate. He has said as much.

Quote
“You’d better believe it,” Trump said. “If I ask them, if I need them, you know, most of the people on this stage I’ve given to, just so you understand, a lot of money.”

Yet, there is no accountability...

"The liberals can understand everything but people who don't understand them."
Lenny Bruce

"The cleverest of all, in my opinion, is the man who calls himself a fool at least once a month."
Dostoevsky