Donald Trump has suggested that US presidential rival Hillary Clinton should be recognised as the founder of Islamic State.

Mr Trump made the remarks in Florida on Wednesday as he denounced US foreign policy while Democrat Ms Clinton was secretary of state.

The Republican presidential nominee said he believed President Barack Obama regretted picking Ms Clinton for his Cabinet.

He blamed her Middle East policies for causing the creation of the Islamic State group, or Isis.

Speaking at an event in Daytona Beach, Mr Trump said: "It was Hillary Clinton. She should get an award from Isis as the founder of Isis."

Mr Trump reassured supporters that, despite a tumultuous week, his campaign "has never been more united".

He added: "The campaign is doing really well. I would say right now it's the best we've been in terms of being united."

Mr Trump has rattled many Republicans with his moves in recent days, including escalating his feud with the family of a Muslim-American soldier killed in Iraq.

He also refused to endorse House Speaker Paul Ryan and Senator John McCain, and suggested that the general election could be "rigged".