And these are on top of the Arizona and Alabama lawsuits.

(WaPo) — The Obama administration is escalating its crackdown on tough immigration laws, with lawyers reviewing four new state statutes to determine whether the federal government will take the extraordinary step of challenging the measures in court.

Justice Department lawyers have sued Arizona and Alabama, where a federal judge on Wednesday allowed key parts of that state’s immigration law to take effect but blocked other provisions. Federal lawyers are talking to Utah officials about a third possible lawsuit and are considering legal challenges in Georgia, Indiana and South Carolina, according to court documents and government officials.

The level of federal intervention is highly unusual, legal experts said, especially because civil rights groups already have sued most of those states. Typically, the government files briefs or seeks to intervene in other lawsuits filed against state statutes.

“I don’t recall any time in history that the Justice Department has so aggressively challenged state laws,” said Jonathan Turley, a constitutional law expert at George Washington University Law School.

The legal skirmishing comes as immigration emerges as a defining issue in the presidential campaign and Hispanic voters play an increasingly influential role. Most Republican candidates are calling for a hard line on the nation’s estimated 12 million illegal immigrants — and criticizing Texas Gov. Rick Perry for some of his positions on the issue.

President Obama is staking out a position on the other side. He told a roundtable of Latino reporters Wednesday that Arizona’s immigration law created “a great danger that naturalized citizens, individuals with Latino surnames, potentially could be vulnerable to questioning. The laws could be potentially abused in ways that were not fair to Latino citizens.”