If the are reasons to believe this AP is unreasonable, one way to try to speed it up is to have an attorney and ultimately political representatives intervene on your behalf. No guaranty of any success but at least you could give it a try.
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Sorry, but nothing will help with the US consulate in Bruxelles. are you a native of Morocco by any chance? Consulate is powerless to issue you the visa prior to having your security checks cllear first. You should have filed in the US with USCIS and you shouldn't have faced this now.
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A lawyer could certainly inquire, but there really are no guarantees.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
You could ask for assistance from a local attorney or congressperson to find out what's going on. Good luck
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