The Supreme Court heard arguments today on whether the line item veto is constitutional. The law gives the president the right to delete spending from parts of a bill passed by Congress without vetoing the whole measure. The Clinton administration asked the court to uphold the line item veto law. Two groups that lost benefits through President Clinton's use of the line item veto asked the justices to find that it violates Congress's constitutional authority over the federal purse. NPR's Nina Totenberg reports.