Barack Obama flatly denies Donald Trump's 'wiretap' claim

Former US President Barack Obama has flatly rejected a claim by President Donald Trump that he - Obama - tapped Trump’s phone in the run-up to November’s election.

Mr Trump made the sensational claim over twitter in the early hours of this morning, and called Mr Obama a "bad (or sick) guy", using his favoured medium of twitter and not citing any evidence or source for the claim.