Of course it is true. It has already been confirmed with warrants issued by the unAmerican FISA court. Clapper is in it up to his bald crown.
The Democrat Establishment claims there is “no evidence” about a LOT of things. Perhaps they even come to believe their own hype. But that remains the prerogative of a dwindling minority. Many more believe that the evidence is there, but the prime directive is to hide it for as long as possible. People might forget altogether.
Memories are short and new stuff keeps coming along all the time to crowd out the original assertions. Mark it down to information overload.