BEIRUT (Reuters) -Lebanon will come up with a plan on August 31 to convince Hezbollah to disarm, U.S. Special Envoy for Syria and Lebanon Thomas Barrack said on Tuesday. Israel will give a counterproposal when it receives Lebanon's plan, Barrack said after meeting with the Lebanese president in Beirut. (Reporting by Jana Choukeir and Nayera AbdallahWriting by Tala RamadanEditing by Peter Graff)