Yes utter disgrace. He had no right to say that to try and influence another country's democratic referendum.
Just as our politicians had no right to comment on who they would back in the US election.
Now are you going to come up with a reason why he was okay to comment or are you going to carry on not making a point?
Errr...freedom? Is free speech a good enough reason?
If not, how about he felt that as the country with whom the US has a "special friendship," He felt that maintaining an open ECONOMIC border with Europe was better for that relationship?
Open your mind, man, and understand that until the shock of Brexit actually happening, it was a very normal, widespread, cosmopolitan belief. It wasn't exactly going out on a limb to suggest that maintaining a strong economic link with the continent was a good thing....unless, of course, you were blinkered to the fact.
And, FWIW, I was in favor of Brexit. I think sovereignty comes before closer economic ties, and if the cost of such ties is the loss of sovereignty, then it is too high of a price....just as I thought maintaining one's own currency and not joining the Euro was a good thing years ago. Hard to be independent when someone in another country controls your fiscal policies.