"You show an amazing albeit unsurprising ignorance of how technology, automation, and the attendant evolution of economics and societies have transformed the world," Brennan said in a tweet.
"Your simple-minded policies - imposition of tariffs - have the potential to seriously damage our future prosperity," said the former CIA Director who served under the previous Obama administration.
He was responding to a tweet from Trump this morning, in which the president rued the trade policies of previous administrations.
"Last year we had a Trade Deficit of almost 800 Billion Dollars. Bad Policies & Leadership. Must WIN again!" the president said in his tweet.
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