[https://amp.cnn.com/cnn/2021/02/19/politics/immigration-us-mexico-border/index.html?__twitter_impression=true](https://amp.cnn.com/cnn/2021/02/19/politics/immigration-us-mexico-border/index.html?__twitter_impression=true) "Twenty-five migrants who had been forced to stay in Mexico crossed the US border in San Diego on Friday, the first group to arrive in the country as part of the Biden administration's rollback of a controversial Trump-era policy, according to a source with knowledge of the process."