Downer is an Austalian diplomat. Papadopoulos is a foreign policy advisor who was part of Trump’s campaign. The claim is that Downer and Papadopoulos were drinking heavily in London in May 2016, and Papadopoulos told Downer that Russia had compromising information/dirt on Hillary. Supposedly Downer passed this comment on to the FBI and that prompted the opening of the Trump-Russia-collusion investigation.
The story seems farfetched to begin with. If at this point Downer won’t even confirm he was drinking with Papadopoulos, that’s significant [or would be, if Rosenstein weren’t running the DOJ].
He’s probably been told by the FBI not to talk about it.
What’s puzzling to me about the story though is that he supposedly met Papa in March 2016 but he did not tell the FBI until after the Wiki dump. But the Wiki dump occurred on Oct 7, long after the investigation began ( ie the investigation began in June 2016 according to Comey). So how could the information have triggered the investigation? The investigation had been underway for four months already.