As Arizona’s controversial immigration law enters the courtroom, Capitol Hill Republicans are trying to intervene in the legal brawl.

This week, Sens. Jim DeMint of South Carolina and David Vitter of Louisiana introduced legislation that would block the Obama administration from suing Arizona over its new law cracking down on illegal immigration. Sen. John McCain of Arizona donated $5,000 to a legal defense fund to fight off challenges to the law.

And the GOP-dominated House Immigration Reform Caucus will file a friend of the court brief early next week backing Republican Gov. Jan Brewer as she defends the law from a taxpayer-funded Justice Department lawsuit.

“Instead of spending time and taxpayer resources on a lawsuit, the Obama administration should be securing the border,â€