Except, he didn't say that. In this article from The Hill that was linked about he said that Trump can and should fix this himself.

“Again, the president can change it with his pen,” he said, warning that Republicans would likely try to add poison-pill provisions to any immigration bill that came to the floor.

“Unacceptable additions have bogged down every piece of legislation we’ve done,” he said.

If the GOP brought up a 'clean' bill that just fixed this problem, it would be fixed today, but they won't do it. Trump could fix it today, but won't, putting blame the blame on Congress.

Trump has said before that 'only he could fix the immigration crisis' well now is his chance.