David Cameron has reportedly spearheaded a diplomatic campaign to improve Britain's relationship with Donald Trump amid concerns the Republican frontrunner could win the presidential nomination.

It comes after more than 570,000 people submitted a petition to Parliament calling for Mr Trump from entering the country, after he called for a “total and complete shutdown” on Muslims entering America.

Mr Trump prompted a wave of anger in Britain after he suggested that British police were scared to go into parts of London because they had become so radicalised.