President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE blasted Democrats on Thursday for supporting so-called sanctuary cities, saying their party has moved so far to the left "that they are no longer recognizable."

"Hard to believe that the Democrats, who have gone so far LEFT that they are no longer recognizable, are fighting so hard for Sanctuary crime," he tweeted.

Hard to believe that the Democrats, who have gone so far LEFT that they are no longer recognizable, are fighting so hard for Sanctuary crime — Donald J. Trump (@realDonaldTrump) October 13, 2017

Trump has vowed to crack down on sanctuary cities, jurisdictions that do not fully cooperate with federal immigration enforcement efforts. He has cast sanctuary cities as havens for criminal undocumented immigrants that blatantly disregard federal law.

The Justice Department moved earlier this year to punish sanctuary cities by cutting off a law enforcement grant to those jurisdictions. A federal judge largely blocked that effort last month in response to a lawsuit filed by the city of Chicago.