I live in the US with a green card (over 10 years). My plan is to apply for US citizenship soon and have my girlfriend come to US with ESTA at the end of September (she was already in US in June for 2.5 weeks). When she comes here, and if all goes well between us two, after two months or so of her being in US we would get married and then start filling out paperwork for her legal immigration status and eventually for her green card.
I know that legally she can only be in US for 90 days, but that the paperwork for her immigration will take more than 3 months.
Thus, will it create any problems if her legal 90 day status ends and she becomes illegal, but the paperwork is underway already?
In other words, US Citizen + ESTA tourist = marriage during 90 day period: issues? concerns? works? doesn't work?