evidence: Is Rubio right that the population of people living in the U.S. illegally doubled and has reached 20 million to 30 million? [...] The number of immigrants living illegally in the U.S. has increased under Biden’s administration after remaining stable for years. But it is not as high as Rubio says. Most immigration groups that estimate this population agree the number ranges around 11 million to 12 million people, despite differences in methodologies. The highest estimate is 16.8 million. Immigration officials don’t let in everyone they encounter, agents have expelled migrants millions of times under Biden. And the number of people living illegally in the U.S. is not static; it fluctuates as people die, leave the U.S. or change their immigration status. Adding the number of border stops under Biden to the estimated number of people already here illegally won’t produce an accurate total.