In an apparent reference to a U.S. district court's order blocking the president's executive action and an appeals court's upholding that ruling, Trump asserted there is a "court breakdown" that is allowing a surge in people from the seven countries coming into the U.S.
The tweet does not mention that any immigrants and refugees admitted from these countries since U.S. District Judge James Robart's ruling on Feb. 3 placed a temporary restraining order on the executive action are either permanent American residents with green cards or have gone through an already-extensive vetting process.
Trump took heat, including from members of his own party, a week ago when he called Judge Robart a "so-called judge."
Also on Sunday morning, the president responded to recent federal immigration raids in major U.S. cities against undocumented immigrants.
Federal immigration officials said the raids last week in Southern California were not connected to the president's executive order on immigration.