The part of the law the justices upheld requires police officers stopping someone to make efforts to verify the person's immigration status with the federal government.
- One making it a crime for an illegal immigrant to work or to seek work in Arizona;
- One which authorized state and local officers to arrest people without a warrant if the officers have probable cause to believe a person is an illegal immigrant;
- And one that made it a state requirement for immigrants to register with the federal government.
"Arizona may have understandable frustrations with the problems caused by illegal immigration" while the federal goverrment tries to enforce immigration law, but the state "may not pursue policies that undermine federal law," wrote Justice Anthony Kennedy in the majority opinion.
The court said that there are several ways for state officials to cooperate with the federal government on immigration enforcement, such as by responding to federal requests for information about when a particular non-citizen will be released from state custody.
"But the unilateral state action" to arrest and detain suspected illegal immigrants "goes far beyond these measures, defeating any need for real cooperation" between the state and the federal government.
Monday's decision is only a prelude to further litgation over what now remains of the Arionza statute.
NBC's Pete Williams reported that "there are other lawsuits against this law. There are several civil liberties groups suing in Arizona, claiming that this law is racial profiling, and those cases have yet to work their way through the courts."
Monday's decision was a partial victory for President Obama who had criticized the Arizona law, saying it "threatened to undermine basic notions of fairness that we cherish as Americans."
In a statement Monday, Arizona Gov. Jan Brewer, who signed SB 1070 into law, claimed that the high court ruling was "a victory for the rule of law. It is also a victory for the 10th Amendment and all Americans who believe in the inherent right and responsibility of states to defend their citizens."
But House Judiciary Committee Chairman Lamar Smith, R-Texas, said flatly that Mondays's ruling was a defeat for those who seek stricter enforcement of immigration laws.
Smith said the decision "limits the ability of states to protect their citizens and communities from illegal immigrants. It is the federal government's job to enforce our immigration laws, but President Obama has willfully neglected this responsibility. This dereliction of duty has left states to address the crime, job loss, and other costs of illegal immigration."
He added, "Unfortunately, under this Administration, today's ruling essentially puts an end to immigration enforcement since the states no longer can step in and fill the void created by the Obama administration."
The Justice Department had moved quickly in 2010 to block enforcement of the law. The administration had argued that the Constitution vests exclusive authority over immigration matters with the federal government, not the states, and that where the federal government has pre-empted state action, no state can intrude on that federal turf.
The majority on Monday essentially agreed with that argument.
In the oral argument before the high court on April 25, Solicitor General Donald Verrilli said Arizona did not have the power to exclude or remove a person who is in the state illegally.
Although some critics of the law have contended that it would inevitably lead to targeting of Latinos simply because of appearance, speaking Spanish, or having a Spanish accent, Verrilli told the justices on April 25 "We're not making any allegation about racial or ethnic profiling in the case."
Since enforcement of the law had been blocked by a federal judge soon after its enactment, the Obama administration did not present a record to the Supreme Court of the law leading to incidents of ethnic profiling of Latinos in the state.
Joining Kennedy's majority opinion were Chief Justice John Roberts and Justices Ruth Bader Ginsburg, Stephen Breyer and Sonia Sotomayor.
Justices Antonin Scalia, Clarence Thomas and Samuel Alito concurred in part and dissented in part.
Justice Elena Kagan, who served as Obama's solicitor general, had recused herself from the Arizona case.
The high court's decision comes just days after Obama announced a new administration policy of not deporting illegal immigrants under age 30 who came to the United States, or were brought to the United States before reaching age 16, who are in school, or have graduated from high school, gotten a general education certificate, or are military veterans. The illegal immigrants covered by the new administration policy will be permitted to apply for authorization to work legally in the United States.
COURTESY OF MSNBC