A federal judge in San Francisco on Monday extended an order blocking enforcement by the U.S. Department of Homeland Security of a new rule requiring employers to follow up on Social Security "no-match" letters.

The lawsuit to stop the rule is continuing. And the extension won't exceed 10 days as plaintiffs in the case ask for an order to prevent the rule from taking affect during the court fight to end it permanently.

The AFL-CIO, the San Francisco Labor Council and others brought suit against the department to stop the rule, claiming the government agency had overstepped its authority. Others have since joined in the suit, including the San Francisco Chamber of Commerce.

The rule would require employers to take certain steps within 90 days of receiving of a letter from the Social Security Administration listing employees whose Social Security numbers did not match their names to fix the situation.