President Donald Trump’s border czar Tom Homan had harsh words for Boston Police Commissioner Michael Cox this weekend — including allegations that Massachusetts authorities had released “child rapists” who were in the country illegally, rather than hold them in custody for federal immigration officials.

The White House's border czar once again singled out Boston on its treatment of immigrants, saying he'll be "bringing hell" to the city. Why it matters: The fight between Boston and the feds illustrates the nation's divide over sanctuary city policies.