WASHINGTON (Reuters) -President Joe Biden on Wednesday called on Damascus to help repatriate a U.S. journalist who disappeared in Syria a decade ago, making a direct plea as pressure mounts on the White House from families of hostages and detainees. Austin Tice, a former U.S. Marine, was kidnapped in August 2012 aged 31 while reporting freelance in Damascus on the uprising against Syrian President Bashar al-Assad. His family believes he is alive and still being held in Syria. The identity of Tice’s captors is not known, and there has been no claim of responsibility for his abduction. Issuing a…