Simon, in Basingstoke, made the astonishing announcement on Thursday evening as he was chatting to Nigel Farage, who is in Washington for the Republican’s inauguration.
Hailing the businessman-turned-politician, the Briton told the LBC host Mr Trump, with his politics could be the man to restore the West to greatness.
However, he also pointed out that many powerful people would benefit greatly if someone assassinated him.
Simon said: “I think Trump could potentially be the saviour of the West. I have one concern about Donald Trump and that is [whether] Donald Trump will actually be alive to undertake all these policies that he has already stated.
The LBC caller said he hoped Donald Trump had a good security detail
“The wealth that he will put at risk and the power that he will put at risk by following through on these policies, and the fact that this is a man that is immensely, personally, wealthy and so is not subjected to bribery like most politicians, which means his assassination would be an enormous benefit to a large number of [people].
“Everyone from the Chinese to Walmart so I hope he has good security.”
Reassuring the LBC caller Mr Trump had nothing to fear after he becomes the 45th President of the US on Friday, Mr Farage said he would probably be the best-protected leader in history.
“The security here, it’s just astonishing,” the former Ukip leader said.
I hope he has good security
“All I can say is I guess there is always an assassination risk, it has happened of course in America too often in the past.
“But I think he will be the best-protected president there has probably ever been in history.”
The LBC caller’s concern came just hours before a bomb squad was called into Washington D.C. after a suspicious package was found on H Street, between 14th and 15th street NW, just minutes away from the White House on Thursday.
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Security around Washington D.C. has been tightened as the first wave of people arrive in the city to see Mr Trump being sworn in America's new president.
Trump tweets his way through Presidency
Mon, January 9, 2017
Express reports Donald Trump's tweets since elected as President of the United States.
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An unprecedented £82million security operation has been ordered for the ceremony and snipers will be sited on rooftops while armoured vehicles will be located on the streets.
In addition to the extraordinary measures, special technology will be in place to stop terrorists flying drones to attack Mr Trump as he delivers his landmark speech.
The swearing-in ceremony will begin with opening remarks at 11.30am (4.30pm GMT), followed by the oath and Mr Trump's inaugural speech.