Seth AbramsonVerified account @SethAbramson
PS/ The level of security/secrecy is *so* high that at least one former federal prosecutor has speculated that the witness is *Trump himself* (which Trump denies). I feel like if it were any of the Trumps, we'd know. Other possibilities: Pence, McGahn, Barrack, Sessions, Hicks...
PS2/ ...Lewandowski, Weisselberg, a former Trump attorney (extraordinary circumstances would have to underlie this subpoena, if so), Schmitz, Gordon, Rhona Graff, Broidy, Nader, a top NRA official, Sater... ...but many of these witnesses are cooperating, so why fight a subpoena?
PS3/ I feel like the man most likely to fight a subpoena—whose identity might lead the feds to close a floor of the DC courthouse; assuming, too, it's not some whistleblower whose name/identity we couldn't possibly know—is Lewandowski. But Sessions, Graff, and Hicks are up there.