ARLINGTON, Virginia July 10 (Reuters) – U.S. lawmakers are considering changes to address concerns about a bill that would give the Biden administration new powers to ban Chinese-owned TikTok, the chair of the Senate Intelligence Committee who has cosponsored the legislation said on Monday. Democratic Senator Mark Warner told Reuters that aggressive lobbying by the ByteDance-owned short video app TikTok against the Restrict Act "slowed a bit of our momentum" after it was introduced in March. Warner said lawmakers have "a proposal on a series of amendments to make it explicitly clear" and address criticisms, including that individual Americans could…