LONDON — A lawyer for Julian Assange said Wednesday that the WikiLeaks founder plans to claim during his extradition hearing that he was offered a pardon by the Trump administration if he agreed to say Russia was not involved in leaking Democratic National Committee emails during the 2016 U.S. election campaign. Assange is fighting extradition to the United States on spying charges, and his full court hearing is due to begin next week. At a preliminary hearing, lawyer Edward Fitzgerald said that in August 2017, then-Republican Congressman Dana Rohrabacher visited Assange at the Ecuadorian embassy in London. Fitzgerald said a statement from another Assange lawyer, Jennifer Robinson, recounted “Mr.