New Delhi, June 25 -- Commerce minister Piyush Goyal and US trade representative Jamieson Greer on Wednesday concluded "multiple rounds" of talks on an interim trade deal, and made "substantial progress", the commerce ministry said, but it did not elaborate on the resolution of outstanding issues such as a valid tariff architecture. "We reviewed progress of... trade discussions and explored avenues to further deepen our economic partnership," Goyal said.P6...