The constitutionality of an Arizona law intended to break down on unlawful immigrants is being confronted by a federal lawsuit filed on Tuesday by the U.S. Department of Justice, stating that immigration enforcement is not a profession for the nation's states.

The lawsuit, filed in U.S. District Court in Phoenix, had come after a broad consultation with law enforcement officials and civil rights groups, who were against the law, shared the Attorney General, Eric Holder.

Holder asserted that setting immigration policy and enforcing immigration laws was a national duty and that seeking to tackle the matter through a hodgepodge of state laws, would only make it more problematic.

Arizona's law has resulted in generation of a national debate.

"The White House must focus on getting the federal government to do its job, which means securing our border and proposing specific reforms to our broken immigration system”, Sen. John Cornyn, R-Texas said.

A forthright critic of the Obama administration, Texas Gov. Rick Perry, although did not make any comments about the lawsuit but said that a law related to the one passed in Arizona, would unjustly saddle Texas law enforcement.

The lawsuit came less than a week after President Barack Obama, christened the state law as ill conceived and called on Congress to pass a broad immigration modification, to avert states from taking issues into their own hands.

Obama accepted that wrecked immigration laws and federal inaction showed the way to annoyance, but said that the Arizona law could possibly violate the rights of blameless American citizens and lawful residents.