Palestinians in Gaza protest Israel's 50th anniversary Bibi Trumps Washington A staunchly pro-Israel Congress and enthusiastic greetings from national Jewish groups have rebuffed administration pressures. JAMES D. BESSER Washington Correspondent Washington etting a sharp focus on efforts to resolve the 14- month Israeli-Palestinian standoff got even harder this week after a dazzling perfor- mance in Washington and New York by Israeli Prime Minister Binyamin Netanyahu, who raised the ante in his high-stakes contest of wills with President Clinton. On Tuesday, rumors were flying about important incremental progress G in the prime minister's meetings with U.S. Secretary of State Madeleine Albright and special U.S. envoy Den- nis Ross — enough progress to war- rant an unscheduled meeting on Monday between Albright and Pales- tinian leader Yassir Arafat. There also were sharp public denials here and in Israel of a break- through. By Monday, the administra- tion seemed in full retreat from the ultimatum it issued two weeks ago that Israel must give an additional 13 5/22 1998 39