But there were recounts in the three “blue line” states, not by Dems but by the 3rd party candidate, Jill Stein. It was claimed that Stein had the backing of the Clinton camp. IIRC, Trump gained a few votes in each case.
Those three recounts uncovered some fraud—especially in Michigan—but it wasn’t pursued and fully investigated. Trump wanted an investigation. Do you recall McConnell saying there would be no $ allocated for vote fraud investigation? Obama couldn’t have known McConnell would put his foot down and forbid it.