President Trump on Friday declared that the US was “full” and that immigrants heading to the southern border should pack it in and go home.

The commander in chief blamed Democrats for the recent surge in migrant families from Central America, with apprehensions nearing an estimated 100,000 in March alone.

“It is a colossal surge and it is overwhelming our immigration system and we can’t let that happen. The system is full. We can’t take you anymore,” the president said during an appearance with federal and elected officials near the border in Southern California.

“Illegal migration, we can’t take you anymore. Our country is full. The sector is full. We can’t take you anymore. Turn around. That’s the way it is.”

Trump asserted that he was right to declare a national emergency at the border and that “everyone” knows it — even Democrats who opposed the move.

Trump also visited a section of border fencing in Calexico that had been replaced, referring to it as a “new” section of his long-promised border wall.

“We’re building a lot of wall. Going to see a piece of it today,” the president said.

But the fence that Trump planned on touring is a two-mile section that was a long-planned replacement for an older barrier.

The White House said the barrier was marked with a plaque bearing Trump’s name and those of top Homeland Security officials.

Trump insisted that US policies had to change — and said that he did not agree with laws that permit immigrants to seek asylum in the US or force the feds to return immigrant children to their parents.

“I have to disagree with it. We’ve been trying to take people and we can’t do it. You can’t do it. We’re going to look at that and look it at it very strongly,” he said.

Officials said that by December 2020, about 450 miles of barriers will be built or replaced.