President Donald Trump has suggested that TV networks that give him "bad publicity" should be stripped of their licences, raising questions about the administration's authority to do so.

"I mean, they're getting a licence. I would think maybe their licence should be taken away," Trump told reporters aboard Air Force One while returning from a state visit to the UK.

The remarks came after the threat of regulatory action from the administration led ABC to suspend late-night TV host Jimmy Kimmel.

Kimmel had made comments about the Charlie Kirk murder suspect, saying Trump supporters had tried to "characterise this kid as anything other than one of them".

In the US, broadcasting licenses are issued by the Federal Communications Commission (FCC), which raises the question: can the Trump administration actually revoke broadcast licences? And does the FCC have the power to regulate content?