U.S. President Joe Biden and Israeli Prime Minister Yair Lapid on Thursday discussed Iran's rapidly progressing nuclear program, with the Israeli leader vowing afterward that "there will be no nuclear Iran."

Biden, who is visiting Jerusalem, said after meeting Lapid that he is working to promote Israel’s burgeoning ties with Arab partners in the Middle East.

The U.S. president, who is set to travel to Saudi Arabia on Friday, said he also stressed to Lapid the importance of Israel becoming "totally integrated" in the region.

Their one-on-one talks are the centerpiece of a 48-hour visit by Biden aimed at strengthening already tight relations between the U.S. and Israel.

"We discussed the Iranian threat," Lapid told reporters afterward. "There will be no nuclear Iran."

Israeli officials have sought to use Biden's first visit to the Middle East as president to underscore that Iran's nuclear program has progressed too far and encourage the Biden administration to scuttle efforts to revive a 2015 agreement with Iran to limit its development.

Resurrecting the deal brokered by Barack Obama's administration and abandoned by Donald Trump in 2018 was a key priority for Biden as he entered office. But administration officials have become increasingly pessimistic about the chances of getting Tehran back into compliance.

Biden, in an interview with Israel's Channel 12 that aired Wednesday, offered strong assurances of his determination to stop Iran from becoming a nuclear power, saying he'd be willing to use force as a "last resort" if necessary.

Iran announced last week that it has enriched uranium to 60% purity, a technical step away from weapons-grade quality.

Iran nuclear arms

U.S. and Iran have been holding indirect talks in an attempt to revive the Joint Comprehensive Plan of Action (JCPOA) agreement under which Iran had limited its nuclear program in return for relief from economic sanctions.

"We've laid out for the leadership of Iran what we're willing to accept in order to get back into the JCPOA. We're waiting for their response. When that will come, I'm not certain. But we are not going to wait forever."

The leaders also pledged on Thursday to deny Iran nuclear weaponry, including through the possible use of "all elements of national power" available to Washington, according to a joint statement.

The statement, to be signed in Jerusalem by U.S. President Joe Biden and Israeli Prime Minister Yair Lapid later in the day, also reaffirmed U.S. support for Israel's military superiority in the region, including with future defence grants.

"I talked about how important it was ... for Israel to be totally integrated in the region," Biden said after the one-on-one meeting with Lapid.

Thursday's meeting could also provide boost Lapid, who is serving as interim prime minister until elections in November. Lapid's main opponent is the former prime minister, Benjamin Netanyahu, and the joint appearance with Biden could help burnish his credentials as a statesman and leader.

Israel will hold its fifth election in less than four years this fall.

Lapid, 58, is a former journalist and television anchor who entered politics only a decade ago. He served as finance minister under Netanyahu, the country's longest-serving prime minister, before becoming leader of the opposition and cobbling together a diverse, eight-party coalition ending Netanyahu's government.

Naftali Bennett became prime minister, with Lapid as his foreign minister. But the coalition collapsed after months of infighting, and Bennett agreed to step aside for Lapid until the election.

Lapid worked hard to solidify his credentials as a statesman while foreign minister. His aides believe the private face time, public appearances and demonstrations of friendship with Biden – who, at 79, is making his 10th trip to Israel – will strengthen that image and get the electorate more comfortable with the idea of Lapid as their leader.

However, Netanyahu is running for prime minister again, and opinion polls have projected that his conservative Likud party will win the most seats in the next election, well ahead of Lapid's centrist Yesh Atid party.

Neither party is poised to singlehandedly capture the majority of seats needed to form a government, and it is unclear whether either man could cobble together a ruling coalition with smaller parties.

Biden played down the political uncertainty in an interview with Israel's Channel 12 that aired Wednesday. "We're committed to the state, not an individual leader," he said.

Biden said Thursday of his meeting with Lapid: "We had a good beginning of a long, god willing, relationship."

Biden is expected to meet only briefly with Netanyahu, with whom who he's had a rocky relationship in the past. Most notably, when Netanyahu was prime minister, his government approved a massive settlement project in East Jerusalem while Biden was visiting the country in 2010. Biden, then vice president, was infuriated.

Much like Lapid, Biden also faces a political threat from his predecessor. Trump, an ally of Netanyahu who still enjoys strong support from Republican voters despite his attempt to overturn the last election, may run for another term.

Asked by Channel 12 if he expected a rematch, Biden replied, "I'm not predicting, but I would not be disappointed."

Given the U.S.'s status as Israel's closest and most important ally, Biden is at the center of the country's attention during his visit.

Israel staged an elaborate welcoming ceremony for him at the Tel Aviv airport, including a red carpet and a band that played the national anthem of both countries. Major television channels set up special live coverage of Biden's arrival, and even broadcast a nonstop loop of his motorcade traveling on the highway to Jerusalem.

Biden can also expect to meet numerous politicians eager to have their photo taken with him, or perhaps share an earful about his administration's attempt to rejuvenate the Iran nuclear deal.

Israel was opposed to the original nuclear deal, which was reached under President Obama in 2015, because its limitations on Iran's nuclear enrichment would expire and the agreement didn't address Iran's ballistic missile program or military activities in the region.

Instead of the U.S. reentering the deal, which Trump withdrew from in 2018, Israel would prefer strict sanctions in hopes of leading to a more sweeping accord.