This hurts him. It hurt Hillary. I said this repeatedly when they selected him to be the nominee and rammed it through.
He has a MAJOR corruption problem. Too few have bothered to really delve into what is out there, but there is a huge amount of evidence of quid pro quo in both the Ukraine and China. There are also other places where they ran this scam to include in Iraq with his brother getting the housing contract from the government.
They've believed their own propaganda that "it's all been debunked." Big surprises coming for them.