Scarborough turned on Trump even before his election.No, it's unacceptable behavior from ANYONE, not just the President. It's the reason we have defamation laws. To prevent people from doing this. BTW, Trump and Scarborough were friends until very recently. This has not been going on for years, nor was there any bad blood.
He's made all kinds of wild accusations (including supporting the use of the 25th) .
I think Mika poisoned his mind with upper east side (NY) claptrap -but just my guess.