If it turns out to be 100% correct and Trump learned but didn't do anything about it, would this be grounds for charges of treason? I actually think so.
Kinda ironic he recently accused Obama of treason for "spying on Trump Tower". Needless to say: Without any proof.
No, it's not treason to not respond to something. Presidents need some leeway to choose not to act when either intelligence is inconclusive or any available response is likely to make things worse (ex. in the middle of delicate negotiations).
I'm sure you'd say the same thing if this happened under Obama or Hillary's watch.
If this happened under Obama, the Senate trial would have already begun
