The Supreme Court rulings were widely expected and unlikely to shake Prime Minister Benjamin Netanyahu's efforts to craft a rightist alliance that might secure him a record fifth term
Israel's top court disqualified on Sunday a far-right Jewish politician from next month's national election and approved the candidacy of a disputed Arab party, overturning March 6 decisions by the election board, a court statement said.
The Supreme Court rulings were widely expected and unlikely to shake Prime Minister Benjamin Netanyahu's efforts to craft a rightist alliance that might secure him a record fifth term.
But they deepened the vitriol of a campaign in which his camp has cast itself as the victim of judicial over-reach and media bias, and has in turn been accused by centre-left rivals of race-baiting and fear-mongering.
The court found in favour of appellants who argued that Michael Ben-Ari of the Jewish Power party had displayed anti-Arab racism. That view was backed by Israel's attorney-general.
Other members of Jewish Power, a small faction that is part of an ultra-nationalist list which last month forged an election alliance with Netanyahu's Likud party, remain eligible to run.
The Central Elections Committee, a monitoring body made up of delegates of parties in the current parliament, last month approved Ben-Ari's candidacy while disqualifying Raam-Balad, a joint party list representing some of Israel's 20% Arab minority.
Israel has in the past prosecuted two Balad figures for contacts with Palestinian militants and accused a former party leader of helping Hezbollah during the 2006 Lebanon war.
The court voided the ban on Raam-Balad, a mix of Islamists and Arab nationalists which describes itself as a democratic movement.
Justice Minister Ayelet Shaked, a fellow rightist in Netanyahu's outgoing coalition, said in a statement that the court's blocking of Ben-Ari "while declaring terror-backing parties kosher is a crass and misguided interference in the heart of Israeli democracy."
Netanyahu's bid for reelection has been challenged by a centrist newcomer, former armed forces chief Benny Gantz. Their escalating exchanges of allegations have included corruption, bigotry, forsaking national security and abetting Israel's foes.
The premier's partnership with Jewish Power also drew rare censure from the U.S. pro-Israel lobby and normally staunch Netanyahu backer AIPAC, which branded the party "racist and reprehensible".
A poll aired by public broadcaster Kan on Sunday put Likud narrowly in the lead to form the next coalition government with a projected 31 of parliament's 120 seats against 30 for Gantz's Blue and White party.
If re-elected, Netanyahu will become Israel's longest-serving premier in July. That bid was dealt an unprecedented blow last month when Attorney-General Avichai Mandelblit announced a plan to indict Netanyahu for bribery and breach of trust. Netanyahu denies wrongdoing and could forestall formal charges in a review hearing after the election.
Raam-Balad, which held eight seats in the last parliament, said the Supreme Court had upheld its "fundamental right to represent our electorate while Netanyahu and Gantz compete to see who can incite more powerfully against the Arab public."