Can my boss threaten to sue me for company losses related to poor job performance if I do not sign a waiver releasing my last paycheck?

Question Details: I left my job to relocate. I worked as a remote technician for a company based in another state. My job duties became to much for me. 9 months before vacating the job, I requested from my employer extra help to lighten my load because I was falling behind on my work. He only hired extra help a month before my last day. My employer incurred financial losses due to my poor job performance. He states I can sign a waiver releasing my last paycheck, and him from suing me and if I don't. then he can and will sue me for the losses. Is this legal? If he does sue, what legal recouse do I have?

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