The British Government's belief was that "if we are going to see off the threat and ideology of Isil we have to work with our Muslim communities, not push them aside or make them feel alienated," he stressed.
Sir Peter joined David Cameron, who earlier called the proposal to ban Muslims "divisive, unhelpful and quite simply wrong", and the Mayor of London, Boris Johnson, who said "the only reason I wouldn't go to certain parts of New York is the real risk of meeting Donald Trump".
Each of these statements has sparked a furious reaction from Mr Trump, who suggested top British officials were "trying hard to disguise their massive Muslim problem". His claim that more Muslims join Isil than the British Army came in a Twitter post on Thursday night and was accompanied by an article from the National Review, a conservative magazine.
Mr Trump is not the first to make the claim, which arose out of a 2014 statement by the Muslim Labour MP for Birmingham Perry Barr, Khalid Mahmood, that there were around 1500 British jihadists and 560 Muslims in the Armed Forces.
The latest government estimates say that 750 British citizens have gone to Syria to fight, while in 2014 there were 650 Muslims serving across the Armed Forces, primarily in the Army.
But experts note that the figure cited for British fighters represents all individuals who have fought in Syria at any time - with any group, rather than just Isil - and includes around 300 who are believed to have returned or died.
- Daily Telegraph