… the campaign expected it would benefit electorally from information stolen and released through Russian efforts …
As I wrote just a few days ago:
Treason is giving aid and comfort to the enemy — like when your campaign knows a hostile foreign power is attacking your country’s election, you seek to exploit the attack for your own benefit, you fail to notify your government that you have knowledge of the attack, and you seek to frustrate the subsequent investigation of the attack.
Again: Why should Trump not be expected to answer a charge of treason?