How does the immediate family law of illegal immigrants of American citizens help?

Generally speaking, it is a simple application for American citizens to apply for a green card for their spouses, minor children and parents. However, if these immediate family members have ever entered the country illegally, they must return to the American consulate in their home country to obtain a visa. Especially under the law 1996, illegal immigrants who stay in the United States illegally for less than one year will be punished for not entering the United States for three years after leaving the country; Illegal immigrants who have stayed illegally for more than 1 year will be punished for not entering the United States after leaving the country1year. For a long time, this immigration law, which has been used to this day, must isolate many American citizens from the immediate family members (spouses, children, parents) of illegal immigrants who are applying for green cards for nearly three years or 10 years. Moreover, many family members decided not to apply for a green card because they could not bear the pain of long-term separation, which is also one of the indirect reasons for the increase in the number of illegal immigrants in the United States. Therefore, this has become the first immigration problem to be solved after President Obama's re-election.