Ummm, using the recently (meaning within the last 4+ years) approved media standards for the burden of proof, we have this information "according to sources", and "it's been reported that...", and is "alleged" to have been said by John Roberts.
That's been a good enough standard of proof for the media to lie about Trump since he announced his candidacy, so it should be good enough proof for liberals, progressives, and the media now.