Palestinian protesters hold posters depicting Palestinian President Mahmoud Abbas in Gaza City on April 29. (Said Khatib/AFP/Getty Images)

As Palestinian President Mahmoud Abbas prepares for his first meeting with President Trump at the White House on Wednesday, the Arab leader and his advisers are expressing a kind of optimism not heard in years.

The Palestinians are saying they think Trump might be the one — with the right mix of bombast and unpredictability — to restart peace negotiations with Israel with the aim of securing Palestinian borders, a capital and a state.

It is an unusual moment because hope is not in abundant supply in the Middle East these days.

Most Israelis and Palestinians tell pollsters that they have low expectations for any change. Israel’s military occupation of the West Bank turns 50 years old in June, and Trump has called a possible Palestinian-Israeli accord “the toughest deal in the world.”

Similarly, former U.S. peace negotiators in Washington and their Israeli counterparts in Jerusalem say conditions are not right for a renewal of talks.

“There’s incredibly low expectations” for the Trump-Abbas meeting, said David Makovsky, a former negotiator who is a scholar at the Washington Institute for Near East Policy.

“There’s no context for a grand deal,” he said. Makovsky said neither Trump’s base nor the Jewish American community seems to be pushing for new talks.

But Abbas and his aides insist that movement is possible and say Trump just might be able to make headway.

Nine months of peace talks under then-Secretary of State John F. Kerry broke down amid bitter recriminations by Israelis and Palestinians in April 2014.

Since then, there was a year-long spike in violence by lone-wolf-style Palestinian assailants armed with knives and family cars, leading to tough countermeasures by Israeli security forces.

Abbas told Japanese reporters last month that he is prepared to hold a trilateral meeting with Prime Minister Benjamin Netanyahu in Washington “under the patronage of President Trump.”

In an interview with Reuters on Thursday, Trump said: “I want to see peace with Israel and the Palestinians. There is no reason there’s not peace between Israel and the Palestinians — none whatsoever.”

Trump sent former real estate attorney-turned-Middle East envoy Jason Greenblatt to Jerusalem and Ramallah in March to explore the possibilities. Greenblatt got good marks from both sides. Trump also named his son-in-law, Jared Kushner, as his point man for making peace in the Middle East.

In March, Trump met with Netanyahu at the White House, where administration officials pushed for constraint on the expansion of Jewish settlements in the West Bank, on land the Palestinians want for a future state. Those talks ended with no firm agreement. There are about 400,000 Jewish settlers living the West Bank on land they say was promised to them by history and God.

By the end of the Obama administration, Palestinian leaders had moved away from seeing Washington as the key to a peace deal, emphasizing instead their campaign to “internationalize” the Palestinian quest for statehood, through U.N. resolutions and a symbolic gathering of world diplomats in Paris.

Trump has spoken with Abbas on the telephone. The meeting Wednesday will be their first face-to-face.

Abbas, 82, is not known for his oratory or sparkle, in public or private. He is often guarded and does not hold news conferences or tweet. He is unpopular among his own people, who question his legitimacy. Palestinian elections are years overdue.

But Abbas and his circle want to hear what Trump has to say. “We are glad that now the U.S. administration listens about us from us, and not from third parties,” Abbas told the Japanese reporters.

Jibril Rajoub, a top Palestinian official and a leader of the dominant Fatah political party, told The Washington Post on Monday: “We are very optimistic. I was in the States recently, and I was told this conflict is a priority issue for President Trump and he is serious to engage and have the ultimate deal.”

Rajoub added: “From our side we will cooperate with President Trump. We believe that he is not in the pocket of anyone, except the American people.” Trump’s “America first” policy extends to national security, “which means settling the core of the conflict in the Middle East,” he said.

The new chief representative of the Palestine Liberation Organization, Husam Zomlot, told the Israeli newspaper Haaretz last week: “When you have a president who from Day One commits himself to peace, and invests time and effort in reaching a solution, that’s the definition of a historic opportunity.”

“President Trump has the political capital, the relationships with all the parties involved, and the will to actually achieve this goal,” Zomlot said.

Since taking office, Trump has met with Egyptian President Abdel Fatah al-Sissi, Jordan’s King Abdullah II, Saudi Deputy Crown Prince Mohammed bin Salman and Israel’s Netanyahu.

Some administration officials have pressed for a regionwide push to solve the Israel-Palestinian conflict, a grand bargain that would give the Palestinians a clear road to statehood in exchange for the moderate Arab states’ public recognition of Israel.

Netanyahu often says he is prepared to meet Abbas anywhere, anytime, without preconditions — before listing his preconditions: that Abbas must recognize not only Israel, which Abbas has done, but Israel as “the Jewish state.” Abbas has been reluctant to do so, in part because more than 20 percent of the Israeli population consists of Palestinian Muslims and Christians.

Today, Israel and its congressional supporters are urging Trump to push Abbas to stop social welfare payments that the Palestinian Authority makes to the families of Palestinian prisoners and assailants either wounded or killed by Israeli forces­ during terrorist attacks.

This would be hard for Abbas because prisoners and “martyrs” are almost unassailable in Palestinian society. The issue has become even thornier since one of Abbas’s main rivals, Marwan Barghouti, and hundreds of other prisoners began a hunger strike more than two weeks ago. Barghouti was convicted by an Israeli court of five counts of murder and membership in a terrorist organization.

Abbas is also hemmed in by the Islamist militant movement Hamas, which has controlled the Gaza Strip since 2007.

If Trump asks Abbas if he speaks for the Palestinians in Gaza, his answer might be a muddle.

Abbas has been fighting with rival Hamas over payments to government workers in Gaza, security arrangements, taxes and who should pay to keep the lights on in the economically crippled enclave.

This week, Hamas issued a policy document, a kind of addendum of its hard-line anti-Jewish founding charter. The new document states for the first time an apparent acceptance of an interim Palestinian state along pre-1967 borders, without recognizing Israel. Some see a softening of Hamas positions, to stay relevant. Israel called it propaganda from a terrorist organization.

Dennis Ross, a longtime U.S. peace negotiator, said at a panel Monday in Washington that after 30 years, “I can safely say that we are at a low ebb.”

He said, “There’s complete disbelief on both sides in an ultimate deal.”

Sufian Taha in Ramallah contributed to this report.