Israelis started voting on Tuesday on Prime Minister Benjamin Netanyahu’s political survival in a fourth election in two years, with the veteran leader hoping his role in a rapid COVID-19 inoculation drive will win him another term.

Opinion polls show the race too close to call.

On trial on corruption charges he denies, 71-year-old Netanyahu is Israel’s longest-serving head of government. Since 2009, he has led the politically polarized nation where supporters hail him as “King Bibi” and opponents call him “crime minister”.

Opinion polls indicated an uptick for Netanyahu’s right-wing Likud party in the campaign’s final days, giving a prospective coalition of conservative and ultra-Orthodox Jewish parties around 60 seats in the 120-member parliament.

The surveys showed a possible, but more unlikely, alliance among right-wing, centrist and left-wing parties opposed to a Netanyahu-led cabinet also fell short of a ruling majority in the legislature, but could also be within reach of power.

Polling stations opened at 7 a.m. (0500 GMT) and will close at 10 p.m. (2000 GMT), when exit polls could point to voting trends, if not a clear winner. Yair Lapid, a former finance minister who heads the centrist Yesh Atid party, has emerged as Netanyahu’s main challenger.

No one party has ever gleaned enough votes for a parliamentary majority on its own in an Israeli election. Election night results may only be a starting point, with a final winner to be determined in backroom coalition talks.

Critics have accused PM Netanyahu of seeking new elections out of self-interest, in hopes of securing enough support in parliament for potential legislation to overturn the legal proceedings against him.

He has denied the allegation, or any personal involvement in prospective criminal immunity moves. Yet he has not ruled out the possibility that allies might pursue them.

On the campaign trail, the premier has shed light on his role in securing millions of vaccine shots from Pfizer Inc and turning Israel into what he dubbed a “vaccination nation”.

Nearly 50% of Israelis have been vaccinated at a pace that drew international praise for Netanyahu as well as calls for Israel to do more to ensure Palestinians in the occupied West Bank and Gaza get inoculated.

Israel’s swift vaccine roll-out allowed it to reopen much of its economy prior to the election. Posting a video on Twitter of his visit to a Jerusalem hospital on Monday, Netanyahu wrote: “Today we are the first in the world to return to life and smile again.”

Netanyahu’s current cabinet, a power-sharing alliance with centrist Defense Minister Benny Gantz, collapsed in December, some 7 months after it was established.

Gantz’s Blue and White party is forecast to win barely enough votes to get into parliament, after he angered many of his supporters by reneging on a promise not to serve under an indicted premier.