Mr Trump and his wife Melania arrived in London on Thursday for the start of their official visit to the UK with a huge police operation in place involving every single force in the country.
Juliet Prager from Quakers in Britain told Premier that even though they're protesting, they still praying for the president.
Speaking during Premier's News Hour, she said: "We're praying for Donald Trump and we're calling on him to undo the harm that we feel his policies are causing to people around the world.
"We're very clear about the fact that there is that of God in Donald Trump and there is that of God in everyone around the world and that is what we're talking about at the moment."
However, Mr Trump has said he believed people in the UK like him "a lot" and has insisted that's down to Britons agreeing with him on issues like immigration.
He's touched down at Stansted and has meetings with the Prime Minister and the Queen over the next couple of days.
The government's admitted policing his visit will cost millions of pounds.
His trip comes just days after he declined to say whether Mrs May should remain in post, and said he had "always liked" Boris Johnson, who quit as foreign secretary over the Chequers agreement.
Mr Trump's arrival in the UK follows the firestorm he caused at the Nato summit in Brussels when he threatened to pull the US out of the alliance unless other nations stumped up extra cash.
The president backed down over the threats when other leaders agreed to increase defence spending "like they never have before" and described himself as a "very stable genius" over the deal.
Mrs May will host Mr Trump and his wife Melania at a lavish dinner at Blenheim Palace on Thursday evening.
After spending the night at the US ambassador's official residence in Regent's Park, London, Mr Trump will join the Prime Minister at a military base on Friday to observe a joint counter-terrorism exercise involving UK and US special forces.
The two leaders will hold talks at the Prime Minister's country residence of Chequers where Russia, Brexit and the Middle East will top the agenda.
Mr Trump will then travel to Windsor Castle to meet the Queen before heading to Scotland for a private part of the four-day visit, ahead of travelling to Helsinki for a summit with Russian president Vladimir Putin.
Listen to Juliet Prager from Quakers in Britain speaking with Premier's Alex Williams:
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