"As the United States continues its 'rebalance' to the Indo-Pacific, growing the strategic, economic, and military partnership between Washington and Delhi is of paramount importance," the group said in an open letter to the Trump, Clinton Campaigns and the Obama Administration.
"Enhancing defence cooperation between the world's two largest democracies and standing together against challenges from Islamic extremism to China's growing assertiveness, should be high on the agenda of the next American President," said the letter.
"As individuals with extensive experience in Congress, the Executive Branch, the uniformed military, and academia, we write to express our solidarity with the people of India as they seek to defend their country and their values from violent Islamism," it said.
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"As strong supporters of the US-India partnership, we call upon the Obama Administration to stand shoulder to shoulder with India as it seeks to uphold our shared values against the common enemy of radical Islamism," it said.
Noting that it is an extremely dangerous world, the letter said the proliferation of weapons of mass destruction has enhanced the danger that localised conflicts of the past could produce more catastrophic global consequences today. The US cannot stand silent as such dangers go unattended.
The letter was also signed by Donald P Loren, former Deputy Assistant Secretary of Defence; Michael Pillsbury, former Assistant Under Secretary of Defence for Policy; Herman Pirchner, president, American Foreign Policy Counciland Jeff M Smith, director of Asian Security Programs, American Foreign Policy Council.