Andrea Shalal, Bhargav Acharya and Aftab Ahmed, Reuters US President Donald Trump said on Tuesday his administration is continuing negotiations to address trade barriers with India and that he would talk to Prime Minister Narendra Modi, in a sign a deal may be imminent after weeks of diplomatic friction. Trump, in a marked shift of tone, said he looked forward to speaking to Modi in the "upcoming weeks" and expressed optimism that they could finalize a trade deal. "I feel certain that there will be no difficulty in coming to a successful conclusion for both of our Great Countries," he said in a post on social media. Modi reciprocated the optimism in a social media post on Wednesday, saying Washington...