Twitter calls Trump tweets 'unsubstantiated' for the first time

SAN FRANCISCO, USA – Twitter labeled two Donald Trump tweets "unsubstantiated" and accused him of making false claims Tuesday, May 26, a first for the social network which has long resisted calls to censure the US president over truth-defying posts. (READ:  Former U.S. president Jimmy Carter's advice for Trump? Tweet less )

The move came amid a growing storm after ...