Attorney General Jeff Sessions urged so-called "sanctuary cities" to comply with immigration enforcement on Monday, saying that jurisdictions who do not abide by the Department of Justice's rules regarding the harboring of undocumented immigrants will not receive federal grant money. Sessions spoke at length about what he said was a high degree of harm caused by undocumented immigrants. The Trump administration has taken a number of actions to enforce the nation's immigration laws and stem the flow of undocumented immigrants. Trump signed an executive order shortly after entering office that called for the enforcement of federal immigration laws and saying sanctuary cities "have caused immeasurable harm" to public safety.