While New Jersey is an "employment-at-will" state, you might have some recourse - it is difficult to tell based on the limited facts you provide here. For example, your new manager might be trying to move you out of the position due to your age, or for some other illegal reason. Right now, you still have your job so you have not suffered any compensible loss. However, you should talk to an employment law attorney who will review the facts and present you with available options.
