"But following a huge groundswell of public support for our plan, it looks like City Hall has rediscovered its sense of humour", activist Leo Murray said in a statement.
The balloon is set to fly in one of the most iconic areas of the city: right beside the Houses of Parliament and Big Ben.
The spokesman added that the activists flying the blimp "will also need to receive the necessary approvals from the Metropolitan Police and National Air Traffic Service in order for it to fly". It will be tethered to the ground.
Who is organizing the protest?
"They just said, it's not going to work, and that's the end of it", Wakefield says.
"Yes, that's right, they don't have guns", he said.
Protests are expected across London when Trump arrives for his three-day visit to the United Kingdom next Friday, with the 6-meter-high (or 19 feet) orange balloon poised to take center stage.
"Disdain for Trump and his hateful agenda unite neighbours and political opponents, brings people of faith and those of no faith together".
President Trump's visit will last for three days, during which he will meet Prime Minister Theresa May at Chequers, Queen Elizabeth at Windsor Castle, as well as dine at Blenheim Palace. "A petition to prevent Trump from making an official state visit "because it would cause embarrassment to Her Majesty the Queen" drew almost two million signatures and received Parlimentary debate in February".
But he also told Channel4 News that a state visit by the U.S. President should be cancelled.
Protesters gathered thousands of petition signatures and raised more than $20,000 to fly the inflatable Trump, diaper-clad and holding aloft an iPhone in its minuscule hand, during two hours of the President's visit and an accompanying "stop Trump" march in central London on July 13.