Merkel has just passed the ball back to Boris. Basically it’s your job to come up with an alternative solution and of course we’ll consider it. We’ve always said that. It’s not my job to sort the UK’s internal problems out. That’s your job. I’m responsible for Germany. So off you go Boris. Go find the Unicorn.
He's just defending the position of the Port of Calais. He's concerned that the UK are looking at other routes to alleviate problems which wouldn't be in Calais' interest. He believes that Brexit is sheer madness.