Four leading House Republicans, citing national security concerns, are urging Treasury Secretary Timothy F. Geithner to block the sale of a Wyoming-based uranium mine to an arm of the Russian government's main nuclear agency. The lawmakers are raising alarm over the proposed sale of a Powder River Basin, Wyoming-based uranium processing facility operated by Uranium One USA, a Canadian-based company, to Atomredmetzoloto, a subsidiary of the Russian government agency Rosatom, according to a letter obtained Tuesday by The Washington Times. The sale was first announced on Aug. 31, and the lawmakers claim that it could give Moscow control of up...