Perry, talking about the working dinner the US President hosted for the Indian leader on Monday, said Trump and Modi discussed LNG (liquefied natural gas), clean coal and nuclear side among other things.
"At dinner, we talked about the three areas of which there will be great back-and-forth cooperation -- deal-making, if you will. One of those is in LNG. The other side of that is in clean coal. Thirdly is on the nuclear side.
"So there is great opportunity for India and the US to become even stronger allies, stronger partners -- energy being the glue that will hold that partnership together for a long, long time."
The US State Department described Modi's first face-to face meeting with Trump as "successful".
"Modi departed Washington after a successful trip to Washington," said State Department spokesperson Heather Nauert.
Trump called Modi a "true friend" twice -- after their meeting in Oval Office and while shaking his hands and hugging him at the end of their media appearance at the Rose Garden.
Both the leaders discussed a range of issues including terrorism, defence and trade. Trump said it was "a great honour" to host Modi "who has been such a great PM".
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