A leading commentator on American politics has questioned the validity of Donald Trump's latest sensational claim, suggesting he made the allegation based on flimsy media reports.
Over the weekend Mr Trump accused his predecessor of wiretapping his phones in Trump Tower during the presidential campaign.
The tweeted allegations have caused a major stir, with FBI director James Comey reportedly asking the US Justice Department to confirm they aren't true, as they imply the FBI broke the law.
Karin Robinson, former UK chair of Democrats Abroad, said the sources of the allegation weren't clear in an interview with Julia Hartley-Brewer.
She said: "In a nutshell, we don’t know exactly what Trump is claiming here, he wasn’t terribly clear to where the alleged sources were.
"As best we can work out from statements from his spokesman, he was basing it on information - not gathered as in his capacity as president - from media reports.
“The only source we can pin down are something he saw in Breitbart news - which were unsourced, unverified.
"It’s entirely possible these allegations made the President fear it, but you’d have thought he’d ask his team to confirm it first."