One of the things former President Barack Obama was known for while in office was engaging in corny quips termed "dad jokes," many of them self-deprecating. So to some people, it may not have seemed out of the realm of possibility in October 2019 that he would have lobbed a "dad joke" on Twitter that invoked the past conspiracy theories about his place of birth and a current scandal involving his White House successor and Ukraine.
The tweet, dated October 4, 2019, was an apparent forgery, as we found no evidence that the 44th president posted it from his account:
The fake tweet was a play on an impeachment inquiry spearheaded by Democratic members of the House of Representatives over allegations that President Donald Trump had attempted to extort damaging information on a political rival from Ukraine by withholding military aid to that country.
As well, the "birth certificate" reference riffed on the "birther" conspiracy theory, the discredited notion proffered by some (including Donald Trump) that Obama was born in Kenya and not the United States, thereby disqualifying him from holding the U.S. presidency.