I was pre approved for a home loan 19 days ago, now the lender is saying that I can no longer get that loan.?

Is there anything that I can do to get the loan that I was originally approved for? There was no change in my credit or status and the pre-approval was good for 90 days.
Update: the explaination was that FHA changed their regulations and now I can't get the loan that he had me qualified for.
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