(BUSINESS INSIDER) — By the end of the summer, President Barack Obama will make what some activists and legal experts say could be the “boldest move” of his presidency as he prepares to move without Congress on immigration reform.

The coming executive actions to change immigration policy could become the defining moment in a second term marred by congressional gridlock. A mid fierce debate over the crisis along the U.S.-Mexico border they also could set up a potential political firestorm just weeks before the crucial midterm elections. Perhaps most importantly, Obama’s coming executive actions could also test the limits of presidential power.

“Depending on how far they go, yes,” David Martin, a professor at the University of Virginia School of Law who specializes in immigration law, told Business Insider. “It could be a significant challenge to the scope of presidential power.”

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