Debate Fact-Check: How Many Illegal Aliens Live in the United States?

In last Thursday’s debate, former Vice-President Joe Biden promised that, if elected, he will create “a pathway to citizenship for over 11 million undocumented people.” While most of the pundits focused on how such a massive amnesty would impact America, there is also much disagreement surrounding the question of how many illegal aliens actually reside in the country. So where did Biden get his “11 million [illegal aliens]” figure? And is it accurate?