United States (US) Secretary of State Mike Pompeo has called for a "free and open" Indo-Pacific region Monday, taking aim at China ahead of a trip to Southeast Asia to promote America's strategic vision for Asia.Pompeo will depart later this week on a trip to Malaysia, Singapore and Indonesia to hammer home the Trump administration's commitment to the region, and also press for denuclearisation in North Korea.The trip comes at a time of tension with Beijing over its moves