Speaking to Sky News, the head of anti-Brexit organisation Best for Britain argued he was no longer proud to call himself British in a world uncovering the grim future Britain is destined to outside the EU.
The former Government minister said he commended George Soros global efforts to defend human rights and freedom of speech, including saving Britain from becoming a "countless power".
Lord Malloch Brown said: “I spent a career both as a British minister but for decades before that working as a very proud Briton in the United Nations, the World Bank, all over the world.
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“And I was very proud to be a British national.
“A country which seemed to stand up for all the best about liberal democracy, human rights around the world.
“I am quite willing to be counted on the side of those who are appalled to see a Britain in the name of a global Britain, a post-Europe Britain becoming what the textbooks will call a countless power.
“Selling arms to Saudi Arabia, sucking up to whoever might give us some trade.
“It is a terrible demeaning of a once great country."
Asked if billionaire George Soros, who recently invested in Best for Britain renewed campaign to reverse Brexit, should not be allowed to interfere in British politics, he replied: “George Soros is a man whose first country of exile when he left Hungary as a Jew fleeing the Nazis and then Communism was Britain.
“He was educated here in London in terms of University, he’s kept a house and a business here.
“And in that sense, look, my claim is not that he’s British. He isn’t.