Judge Andrew Napolitano said this morning that President Obama's upcoming announcement of executive amnesty for illegal immigrants is "more profound" than anything he's seen from a U.S. President.

He recalled that he's seen a lot of presidents do things that he disagreed with, but in this case, he argued that Obama is a constitutional law scholar and knows this is illegal. 

"It's disturbing and it's destabilizing to the relationship of the Congress to the presidency and the courts," he said.

Napolitano said presidents have made "risky and bold" decisions in the past, but usually those decisions have the support of the American people or involved an emergency.

"There is no emergency that needs to be addressed, he does not have popular sentiment behind him and he's wrong on the law. So why's he doing this? Is it just some ideological frustration that he wants to put a thumb in the eyes of the Republicans and the rest of us who believe that the Constitution means what it says?" he asked.

Napolitano said when one branch of government "grabs power" from the other it results in "less liberty" for the rest of us. 

He also pointed out that this temporary amnesty would expire when Obama leaves office, harming illegal immigrants in the long run.

Watch his full analysis above, including his explanation of why this action is not the same as what Ronald Reagan did in the 1980s.

Read Judge Nap's Washington Times op-ed as well, entitled "Playing with constitutional fire."

Watch President Obama's primetime address and all of the reaction on Fox News, tonight at 8p ET.