Should Obama proceed with bombing Syria without UN sanction, could he not be impeached?

We didn't impeach Bush (for whatever that is worth.)

The Repubs now control the House.

No, he should not proceed with bombing Syria with or without the UN sanctions. What could he be impeached for if congress gives him the OK?

And mostly, no, if congress gives him the OK, its going to take a lot of republicans to go along.

=more than half. that is the rule in the house, now, to even bring it up for a vote.