Employer will terminate I-140 and you will have to start all over with the new employer.
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I concur with Mr. Segal.
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The biggest risk is that, as you said, you need to start afresh.
The second risk is that the current employer may blackball you in the community for not being a loyal employee.
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You should file premium processing on the 140 and get it approved before you change employers. Once the case is approved, even if the employer cancels the petition, you can still use the date to port to another green card.
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