President Donald Trump has used "Game of Thrones" imagery to push for his wall on the US-Mexico border and to hint at fresh sanctions on Iran. "GAME OVER," he declared in an unmistakably "Game of Thrones"-esque tweet. Trump was pictured from behind, wearing his trademark black overcoat, against a backdrop of mist or fog. "NO COLLUSION, NO OBSTRUCTION. For the haters and the radical left Democrats," it said.