President Donald Trump on Saturday accused former President Barack Obama of tapping his telephones during last year’s election, lodging a startling allegation of abuse of power without evidence or explanation. In a series of angry morning tweets, Trump suggested his predecessor was behind a politically motivated plot to upend his campaign.

President Donald Trump on Saturday accused former President Barack Obama of having Trump Tower telephones “wire tapped” during last year’s election, a startling claim that Obama’s spokesman said was false. Trump, whose administration has been under siege over campaign contacts with Russian officials, said in a series of early morning tweets that he “just found out that Obama had my ‘wires tapped’ in Trump Tower just before the victory.