It might be possible to sue the principal and possibly even your current employer on several different but related grounds, but among them are 1) tortious interference and 2) defamation. Your damages would be the lost wages
from the new job.
You really ought to have an in-office consultation with a local employment law
attorney to review the entire situation. If you have had no employee evaluations, you would need to consider how you would go about proving that you do your job well. You can review your options for doing this with the attorney, but consider ahead of this consultation who could (and would under oath) vouch for the quality of your work.
It may be that no lawsuit would need to be filed. Sometimes, a letter from an attorney on official letterhead outlining the grounds for a proposed lawsuit is sufficient to educate potential defendants about the error of their ways. Possibly, a letter from an attorney could cause your current principal to re-evalutate the wisdom of this course of action in time to allow you to take the other position.
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