A garbled remark
This does not narrow it down, sadly. It's disappointing the "leader of the free world" is so inarticulate. It does not reflect well on his supporters (nor his "locker room talk", attitude to paying tax, the list goes on).
Back on topic, is there a transcript of the discussion between Giuliani and the Ukrainians? Maybe that's where the quid-pro-quo smoking gun is. Aside from the mutual political fellatio, the Biden thing seems to be the main focus of the call disclosed here.