Biden and Trump discussed how 545 children separated from their families should be reunited. Here's the background.

In court filings from the U.S. Justice Department and the American Civil Liberties Union on October 20, it was revealed that lawyers have not been able to reach the parents of 545 children who had been separated from their families by U.S. border officials between 2017 and 2018.

Hundreds of parents may also have been deported back to Central and South A…