The memo is reported to be Nunes', or the product of the House Permanent Select Committee on Intelligence. I gather it to be a summary of findings, a sort of "redacted" paraphrase of base evidence. No DEM was involved in producing it. Those DEMs that speak of it claim it is misleading.
GOP Lawmakers Petition Chairman Nunes to Release HPSCI Memo
The truth about the new "top secret" memo Republicans can't stop talking about <- This article is a hoot
But since we know that every word that RATs speak is a lie (including "and" and "the")
We can "deem" it to be leading.