Sir Keir Starmer has wished Donald Trump a 'quick recovery' while condemning the 'appalling' assassination attempt on his life at a campaign rally on Saturday afternoon.
The Prime Minister is understood to have spoken with the former US President during a telephone call on Sunday, despite his team suggesting he write to Mr Trump instead.
During their conversation, Starmer also expressed his condolences for the victims and their families.
The call is being viewed as an early attempt by Starmer to preserve the special relationship between the United States and Britain.
The Prime Minister's call follows a social media post on X to the horrifying incident, in which he said: "I am appalled by the shocking scenes at President Trump's rally and we send him and his family our best wishes.
"Political violence in any form has no place in our societies and my thoughts are with all the victims of this attack.'
Mr Trump held back tears overnight as he entered the Republican National Convention in his first public appearance since his assassination attempt.
Trump, 78, looked emotional as he walked into the conference centre in Milwaukee, Wisconsin, on the first day of the convention on Monday.
Wearing a bandage over his right ear, the Republican nominee appeared defiant after Saturday’s shooting at a rally in Pennsylvania.
Trump waved at the packed arena and received a hero’s welcome, with cheering supporters giving him a standing ovation as Lee Greenwood sang “God Bless the USA.”
He greeted his family, before taking a seat between commentator Tucker Carlson and JD Vance, his new running mate.