Can an illegal immigrant obtain US citizenship by marrying a US citizen?
No. The "unlawfully present" foreign national must voluntarily
return to his or her country of origin or be deported and the
citizen spouse must apply for their reentry under the USCIS spousal
requirements. FYI, marrying a US citizen for the purpose of
obtaining permanent resident status and/or citizenship is a federal
felony and is punishable by a maximum $250,000 fine and maximum 5
year prison sentence for any or all involved parties if