Houthis warn US of 'painful response' if it joins Saudi conflict. Houthis have warned the US of a "painful response" if it joins Saudi Arabia's military campaign against it in Yemen. "If the US becomes involved...there'll be a swift and painful response targeting the US and all its interests in the region," Houthi spokesperson Mohammed Al Bukhaiti said. The warning comes after Houthis launched missiles and drones at Saudi airports.