Retired US Army Colonel Lawrence Wilkerson said he "absolutely" thinks the end game is to provoke Iran enough in order to go to war.
"The German minister summed it up quite well, he said what Trump has done is make the Iran agreement a domestic play thing, in other words domestic politics," he told MSNBC's AM Joy programme.
"By doing that he’s assured that the nuclear agreement will fail ultimately, and then what you have is one choice: war."
German Foreign Minister Sigmar Gabriel said if the US Conress decides to reimpose sanctions or terminate the deal completely, it could result in Iran developing nuclear weapons and raising the threat of conflict.
Asked if he thought the end game of Congress's move to impose new sanctions against Iran was to provoke the country to war, Mr Wilkerson replied: "Absolutely. I think that we're doing the same thing we did in 2003 with Iraq.
"We're marching down the road to war. If you think Iraq was a bad war, wait until you see Iran."
Mr Trump's refusal to formally certify Tehran was complying with the 2015 accord and his accusations it violated the deal led Iranian President Hassan Rouhani to accuse him to making "baseless accusations."
In response, the US President said Iran was spreading "death, destruction and chaos" around the world with its actions in Syria, Iraq and Yemen.
When he was asked to describe why he believed the war would be worse, Mr Wilkerson said: "Trump said yesterday Iran is spreading global destruction, chaos - Saudi Arabia is the one doing that.
"The bloody war in Yemen, which we're sad to say, involved in with refuelling and targeting intelligence and bombs is the bloodiest war on the face of the Earth right now. The greatest humanitarian disaster since WWII with cholera and starvation. We're part of that."
He added: "The Saudis are far worse than Iran and we're getting ready to make that situation even worse, more profoundly destabilising, by taking on Iran militarily. There is no other choice. If you say it's unacceptable like Tillerson did, that Iran has a nuclear weapon, you either get [rid of them] through diplomacy or you get it through war."
Describing developing situations in Venezuela, Iran and Syria, he said: "I'll look at the camera right now and tell every GI out there, you've had 17 straight years of war, get ready for 17 more."
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