Yes, however depending upon the specific circumstances the process can be very complicated and lengthy. That aside, being married to a citizen does not convey immunity status on a alien legal or not from being deported under USCIS laws. http://www.uscis.gov
US Citizens can't be deported from the US. Any alien can be deported.
Deported
no
Yes. If the illegal immigrant marries a citizen, they can become a citizen from that.
Once you are officially married to an American citizen, you can not be deported from the country, unless you engage in a criminal offense.
Not automatically.
only if the person marries a US citizen
The marriage may be valid, but once the person is deported, for any reason, he/she is guilty of "agrivated re-entry" if he/she ever returns to the U.S. The spouse is welcome to live with the illegal immigrant in his nation of birth as husband and wife.
no they do not the Mexican instead becomes an American citizen
I am not a lawyer, and as such I am not entitled to give legal counsel, but if the marriage can be proven to be a sham, it can be dissolved and the alien can be deported. This is fairly rare, has happened in few cases, but the other party in such can be held liable for fraud.
Yup
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