“Hey Amber, for your next brainwave, why not announce that foreign workers will be tattooed with numbers on their forearms? You might as well do the job of killing Britain’s reputation as an open, enterprise economy properly,” Mr Hilton wrote.
The plan has also been criticised by Ms Rudd's PR boss brother Roland, who said it amounted to the "denigration of non-British workers".
The former Downing Street aide, who campaigned to leave the EU, accused the Prime Minister of seeking a "closed Brexit" that will cut Britain off from the international community.
"It conjures an image of a shrunken Britain, retreating from the world. Closed Brexit gives Brexit a bad name – and, sadly, it’s becoming the settled view of Brexit around the world. It is incompetent and irresponsible for May to have allowed that to happen," he argued.
Maybe Steve Hilton should have thought more carefully about giving his support to a campaign built on xenophobia.