You might recollect the rumour that Obama wasn't born in the USA. It was false, of course, but a leading light in publicising the rumour was Donald Trump.
Now there's a rumour that Trump was born in Pakistan.
This, of course, is also completely unfounded, and it's already been debunked by Snopes.
Did you know that the word "irony" isn't in Websters US dictionary? Or the word "gullible".