BEIRUT, June 12 (Reuters) - Hezbollah is confident that Iran will insist on Lebanon being included in a deal with the United States, a leading Hezbollah politician said on Friday, as hopes grew for an agreement between Tehran and Washington. Hezbollah, founded by Iran's Revolutionary Guards in 1982, entered the regional conflict in support of Tehran on March 2, opening fire at Israel and prompting an Israeli offensive that has killed thousands of people in Lebanon. Iranian officials have repeatedly insisted on an end to fighting in Lebanon as part of any wider agreement.