Democrats want to make conditions as comfortable as possible for anybody looking to enter the country illegally. The end result as that more people are flooding across the border which is pretty much the goal.
The laws that forced family separations could have been changed by Democrats. They refused, so Trump had to change his policy instead.
According to the Washington Examiner:
President Trump said Tuesday that he is not planning to reintroduce the policy of family separations at the U.S. border with Mexico.
“We are not looking to do that, no,” Trump said, when asked by reporters in the Oval Office.
But the president also suggested that family separations could be an effective deterrent to illegal immigrants and that more migrants come to the border when separations are not used. “When you don’t do it, it brings a lot more people to the border,” Trump said.
He asserted that Barack Obama built the cages in which separated children were kept.