"Guardian would aid the Indian Navy in meeting a vast spectrum of maritime security and maritime domain awareness challenges, such as maintaining freedom of navigation, maritime search and rescue, protection of commercial activity and disaster response," Senators Mark Warner and John Cornyn wrote in a letter to Kerry.
Warner from the Democratic Party and Cornyn from the Republican Party are Co-Chairs of the Senate India Caucus - the only country-specific caucuses in the US Senate.
It is understood that the Pentagon has extended its full support to the request made by India in this regard.
But a section of the State Department still needs to be convinced on this issue, informed sources said attributing this to a result of the strong Pakistani lobby here having launched a campaign against sale of unarmed Guardian drones to India.
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In their letter dated September 2 - a copy of which was obtained by PTI today - the two Senators reminded the top American diplomat that improving India's maritime domain awareness is a key priority in the Joint Statement released by Carter and Parrikar in April 2016.
"Guardian is the only RPAS system that would fulfill India's maritime security and maritime domain awareness requirements," they said.
"The maritime environment in which the Indian Navy operates is both vast and diverse. Guardian provides persistent 360-degrees wide areas surveillance and is capable of operating at high altitudes, avoiding changing and unpredictable weather patterns over the Indian Ocean and beyond," the Senators wrote.