Allies of Donald Trump have dismissed claims Charlie Kirk was killed by a lone assassin.

Senior figures in the Maga movement believe Tyler Robinson, the student charged with Kirk’s murder, is part of a wider conspiracy involving a Left-wing terrorist network, and that authorities need to widen the scope of their investigation.

The FBI has suggested suspect Mr Robinson may have worked with others, although no one else has yet been charged in connection with the crime.

Kash Patel, the FBI director, told senators on Tuesday that the bureau was investigating “who, if anyone, was involved as an accomplice”.

Steve Bannon, Mr Trump’s former chief strategist, claimed that Kirk’s death was “not a simple murder” and that the truth was “far deeper and far more malignant”.

“There’s a vast conspiracy at the back of this,” Mr Bannon said on his War Room podcast on Monday.

“I am absolutely not buying this [theory],” he added.