"If Trump truly wanted to emulate Churchill, he would celebrate the peace and prosperity of Europe and seek to strengthen rather than destroy trans-Atlantic ties", said Amanda Sloat, a senior fellow at the Brookings Institution and a former State Department official in the Obama administration.
He said Britain was "a pretty hot spot right now with a lot of resignations". "I'm very strong on immigration". That prompted almost half a million people to sign a petition calling for Trump to be banned from the UK.
Trump is expected to arrive in London Thursday after a North Atlantic Treaty Organisation summit in Belgium.
Mr Smyth said he hoped the protests, and specifically the Trump baby blimp, do not upset the American public.
Mr Trump will instead be ensconced at Windsor Castle, west of London on Friday when a blimp tethered next to the Houses of Parliament.
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Trump has demonstrated all of these tendencies before - including suggesting his hands are tied on pressing Putin. Trump's comments came in a wide-ranging news conference after attending a special meeting on defense spending.
Donald Trump flies in to a rough reception
Unlike visits from previous presidents, he won't be spending much time in London after his arrival. For protesters in Edinburgh they have a particularly varied day to look forward to.
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He also acknowledged the loss of a former navy SEAL, Saman Kunan, who died last week while replenishing air tanks inside the cave. Doctors suspected two had lung infections - probably pneumonia - based on irregular X-rays.
But there are still plenty of detractors, as loudly demonstrated by a passenger in auto driving past the USA flag-adorned pub who shouted "F*** Trump", to which Mr Smyth chuckled.
Asked about Trump's comments, May said: "We're delivering on the vote of the British people to take back control of our money, our laws and our borders".
Tens of thousands of people are expected to attend more than 100 protests being held across the country against the American President's visit over the weekend.
The largest demonstration is expected in central London on Friday where a giant "Trump baby" balloon will fly close to Parliament after being given the go-ahead by London mayor Sadiq Khan. The issue is 'Do they have freedom to protest, freedom to assemble and should they be allowed to do so?
Unlike visits from previous presidents, he won't be spending much time in London after his arrival.
Mrs May will be looking to improve her often publicly strained relationship with the USA president as she pushes for a post-Brexit trade deal with America. Events will include "toss the welly at Trump" and a Trump coconut shy.