President Obama in a prime-time address to the nation Thursday night trumpeted his executive action to protect 5 million undocumented immigrants from deportation, saying the most extensive overhaul to the immigration system in decades would limit “real amnesty” in the United States.

Ignoring GOP cries of executive overreach, the president opted to move ahead with unilateral action that adds fuel to the simmering feud over the limits of his executive authority.