0. Change of Employer with Approved LABOR

[sweetpoi098]

I worked with employer A untill Mar 2012 who got labor approval in Feb 2012.
I changed to employer B who will process greencard for me in Jun 2012.
But Can my old employer A process I-140 since I want to protect the Priority date?
old employer A doesnt know yet that I changed to employer B.

Thanks,
Subramanian