JERUSALEM — Anxious Israelis watched as election results took shape on Wednesday after many voters delivered a rebuke to Prime Minister Benjamin Netanyahu ’s far-right government, with the highest turnout in over a quarter-century. Exit polls suggested there was no clear winner and that weeks of negotiating could lie ahead. Arab-led parties appear to have made a historic showing, but it's not clear if opponents of the government, who exit polls suggested will have a majority in the next parliament, would form a coalition with them. Issues around the Palestinians and their descendants remain incredibly sensitive in Israel. Netanyahu was defiant early Wednesday as he seeks to remain the country's longest-serving prime minister. He dismissed the idea of a partnership with Arab parties — whose constituents make up 20 percent of Israel’s population — as treasonous. “We must establish a strong, right-wing, nationalist government,” Netanyahu said. “We must not endanger Israel and establish a government that relies on anti-Zionist Arab parties.” His top challenger, centrist for