Obama created this mess when he issued an illegal Executive Order establishing DACA, which in effect made immigration law.   Congress and only Congress can make or change laws.  Several law suits filed by states challenging the constitutionality of Obama’s EO are currently working their way through the courts and ultimately will be heard and settled by the Supreme Court.  Trump’s best course of action would be to issue an Executive Order extending DACA pending the Supreme Court’s decision or until Congress changes the law to allow those effected by DACA to remain permanently in the U.S., whichever occurs first.