Can employer change sponsorship agreement during employment

Vaibhav2016

New Member
Before joining I have a singed a sponsorship agreement for green card with my employer. Its almost more than 2 years I am working for this employer. Now my employer is changing few conditions in this sponsorship agreement and asking me to sign this agreement. Is this legal? Can employer change these condition which we already agreed two years back? This new agreement will put more financial burden on me and I don't agree to this new conditions. Please advise what options I have. Please treat this urgent.
 
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