I would think at falls under the crime of fraud, since he and the DNC (whose certifications put him on the ballots of all the states and DC) tacitly implied that he was constitutionally eligible. In the case of Hawaii, the DNC certified explicitly that he was constitutionally eligible.
As for a possible charge of treason, I don't think it would fly under these circumstances. Remember that treason is specifically defined in the Constitution: Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort.
Treason is reserved for citizens.
A foreign national who commits a crime against the U.S. citizenry by usurping the government, well, that is very, very serious, essentially a coup. Any Americans who knowingly helps in that coup is in deep trouble, too.
I believe we have a whole series of hanging offenses to contemplate.
A case could be made.
Yikes Justice...you don't believe what he has been "levying" against us [We the People] qualifies as war?
A case could be made that dropping charges against the terrorists who bombed the USS Cole, stopping the lawsuit against the Saudis by the 9-11 Families, changing the ROE making our Troops sitting ducks...just for starters...would certainly constitute adhering to our enemies, giving them Aid and Comfort.
Hello, there are those of us who think he qualifies for Treason now!