(Adds quotes on occupation, Iran) By Doina Chiacu WASHINGTON, March 23 (Reuters) - The United States expects the next Israeli government to end nearly 50 years of occupation and clear the way for a Palestinian state, White House chief of Staff Denis McDo**ugh told Jewish Americans on Monday. To cheers from the liberal Jewish group J Street, McDo**ugh vowed to safeguard Israel and criticized Israeli Prime Minister Benjamin Netanyahu's abandonment of a Palestinian state in the run-up to his re-election on March 17.