The problem with the immoral person is OK as long as the policy is moral argument...is that is not based in reality. Trump is immoral and therefore his policies are often immoral.
The FBI wants to investigate the Khashoggi killing and Trump wants to sweep it under the rug...let a murderer off the hook. How is that moral?
He continues to use federal employees as a bargaining chip, making their lives harder for no good reason...how is that moral?
He immigration policy is based on cruelty. There is no denying this. It might be effective (but probably not...they are still coming), but you can't argue it is moral.
He wants to abandon our long-time Kurdish allies in Syria that have fought and died advancing US interests.
He refused to put his business interests into a blind trust, and is obviously using the presidency to enrich himself personally.
It is one thing to have voted for Trump. It is another to continue to support him without question....and to claim your support of his is based in morality??