Michael Moore gets on my last nerve, but he's got a point with this open letter to Ivanka:

AN OPEN LETTER TO IVANKA TRUMP FROM MICHAEL MOORE: "Your Dad's Not Well"

Dear Ivanka:
I’m writing to you because your dad is not well.

Every day he continues his spiral downward – and after his call for gun owners to commit acts of violence against Mrs. Clinton, it is clear he needs help, serious help. His comments and behavior have become more and more bizarre and detached from reality. He is in need of an intervention. And I believe only you can conduct it.

He trusts you. He believes in you. Although I don’t know you personally, you seem to be a very smart and together woman. I think he will listen to you. He must because he is now not simply a danger to himself, he has put the next president of the United States in harms way. He has encouraged and given permission to the unhinged and the deranged to essentially assassinate Hillary Clinton. Her life is now in worse danger than it already was – and should anything happen, that will not only be on his head but also on those closest to him if they stand by and do nothing. I say this with the utmost kindness, care and concern for you, and I know you will do the right thing. Bring him in, off the road, away from the crowds. Now. Tonight.

And when you do, here is what a good friend of mine, a former counselor and social worker, Jeff Gibbs, suggests that you say to him:
...snip conversation

Ivanka, I have faith in you that you can do this. I know I’ve called your dad “crazy” before, but I was speaking politically, not clinically. This has gone beyond “crazy”. The entire nation — in fact, the entire world — needs you to step forward and do the courageous thing history will praise you for: the loving act of a brilliant daughter who also loved her beleaguered country enough to say her father wasn’t well and needed help.
Thank you, Ivanka.

Yours,
Michael Moore