The federal judge who temporarily blocked President Donald Trump 's executive order denying U.S. citizenship to the children of parents living in the county illegally is a "tough" legal expert who made lawyers appearing before him "nervous," according to an attorney and former colleague.

Senior U.S. District Judge John C. Coughenour listened to 25 minutes of arguments before rejecting the order, halting the policy from coming into effect for 14 days. There will be an injunction for a permanent block once the initial period is up.