WASHINGTON, June 2 (Reuters) - G7 finance ministers are expected to endorse a U.S. proposal for an ambitious global corporate minimum tax when they meet on Friday and Saturday in London, a U.S. Treasury official said on Wednesday. The official said in an emailed statement the Treasury expects the G7 meetings to provide momentum for advancing global corporate tax negotiations towards a broader G20 finance meeting in July in Italy. (Reporting by David Lawder Editing by Chris Reese) Our Standards: The Thomson Reuters Trust Principles.