When will it end?

It is of course a matter for the Americans, but just how much longer can Trump continue doing what he's doing?  He has shown himself as someone who is prepared to tell blatant lies when it suits him - and then deny he did so, claiming he was simply repeating what someone else had said. He has shown himself as a charmless nerk who is not prepared to observe the basic niceties with the head of a supposedly friendly nation, nor offer an apology to another friendly nation he has traduced.  Like I say, I think we are entitled to wonder - how much longer?