Washington, June 3 US Secretary of State Marco Rubio vigorously defended the Trump administration's restructuring of US foreign assistance programmes, rejecting Democratic criticism that cuts to aid and the dismantling of parts of the foreign aid bureaucracy have weakened America's global influence and contributed to humanitarian suffering.Appearing before the House Appropriations Subcommittee on National Security, Department of State and Related Programs, Rubio argued that the administration's approach has made American assistance "more nimble, more responsive" and more closely tied to US national interests."The core of our foreign policy must always be the national interest of the United States," Rubio told...