Deferred Action for Childhood Arrivals (DACA) of illegal aliens was always meant to be a “temporary stopgap measure” to provide protection to illegal aliens until Congress created actual law, then-President Barack Obama declared when he introduced his executive order instituting the policy.
On June 15th, 2012, in a speech at the White House Rose Garden, Obama stressed that DACA was not law - just a short-term measure to give Congress time to take required action:
"Let us be clear: this is not amnesty, this is not immunity, this is not a path to citizenship. It's not a permanent fix. This is a temporary stopgap measure that lets us focus our resources wisely while giving a degree of relief and hope to talented, driven, patriotic young people."
"Precisely because this is temporary, Congress needs to act."
Obama repeatedly called on Congress to pass legislation to provide a permanent solution for young illegal immigrants.
On Tuesday, in his announcement a six-month phase-out of DACA, President Donald Trump echoed Obama’s words, saying he was giving Congress time to legalize the principles of DACA – if it chose to do so.