President Obama's Immigration plans have, not unexpectedly, drawn both praise and criticism.

Outside the White House, supporters of the plan - which in part would ease deportation threats - held signs and chanted their approval.

(nats up full WE HAVE AN EXTRAORDINARY VICTORY TODAY!)

But Congressional Republicans have made their disapproval just as clear.

At issue is whether Obama's plans are legal and within the confines of the U.S. Constitution.

Republicans say, they are not.

(SOUNDBITE) (English) HOUSE SPEAKER JOHN BOEHNER SAYING:

"...he's not king' and he's 'not an emperor,' but he sure is acting like one."

Part of the reform would allow nearly five million undocumented people, most of whom are parents of children born in the US, to stay with their families.

Here a crowd watches the president's speech outside a detention center in Los Angeles.

Some hope the reform will, in Obama's words, help them come out of the shadows.