I find it illuminating that so many are in DC. Either Congress don't know what's been happening in their own house, or they have been complicit all along.
By the way, the number of illegals could be "much higher" than 20 million, possibly up to 10% of the US population.
Q: How can such a huge number NOT have been noticed?
A: The same way no one noticed that illegal drugs have been flooding into our country - because the right people made LOTS of money in the process.