India, Jan. 12 -- India is expected to raise five key issues - marine exports, business visas, social security, access of Indian pharmaceutical products, and exports of table grapes and mangoes - during US Trade Representative (USTR) Katherine Tai's India visit on Friday, two officials aware of the matter said. Tai is visiting New Delhi from January 12-14, and is scheduled to meet external affairs minister S Jaishankar and commerce minister Piyush Goyal to discuss issues related to trade and investments. The 14th India-US Trade Promotion Forum (TPF), a bilateral mechanism to resolve trade issues, will meet on Friday. It will be co-chaired by Tai and commerce minister Piyush Goyal.HTC...