He has resided and worked in the country illegally for 16 years. Getting married at the end of that time doesn't automatically grant you legal status, you have to apply for adjustment of status at which point they will review your history with adhering to US immigration law. He could have chosen to be deported, per the terms of the visa waiver program he entered on, but he chose not to so he can wait in detention until the legal process he has repeatedly avoided proceeds.

Majority of Americans are against illegal immigration. Only liberal elites want it in order to stay in power. The people do not want this. Every poll confirms this.