From Fox News:
President Trump 
responded to reports Friday that his administration proposed releasing immigrant detainees in sanctuary cities by not only confirming the plan but saying it remains under “strong” consideration.
Further, the president tweeted that relocating illegal immigrants to these districts should make the “Radical Left” happy. The comments came after The Washington Post first reported that the White House proposed sending the detainees to sanctuary cities twice in the last six months. The proposal was first floated in November amid reports of a large migrant caravan from Central America making its way to the southern border. The idea was again considered in February, amid the standoff with Congress over a border wall.