The president's comments come 19 days before the midterm elections, and he is rallying his base over his central campaign issue of hardening U.S. immigration policy. The president has said repeatedly that he thinks immigration should be a top issue on the campaign trail, as Republicans are fighting hard for control of the House and Senate.
Earlier this week, the Trump administration said 66 children, including one under 5 years old, remain in custody and separated from their families as part of its immigration policy. Parents of 50 of the children have already been deported, according to the administration's numbers.
The zero-tolerance immigration policy which resulted in family separations became a source of controversy this summer. The president shifted his position on the policy at times, saying both that he opposed family separations but also defending the move as a deterrent to undocumented immigration.
Mr. Trump defended the policy in an interview with 60 Minutes on Sunday. "When you allow the parents to stay together, OK, when you allow that, then what happens is people are going to pour into our country," he said.
Congress hasn't allocated funding for President Trump's long-promised border wall yet, and the spending bill for the department that would fund such a wall, Homeland Security, has not been completed. There's likely to be a showdown over the funding for the border wall after the midterm elections.