JERUSALEM — Israeli Prime Minister Benjamin Netanyahu headed to Washington on Sunday vowing to “make history” as he prepared to meet President Donald Trump for the unveiling of the U.S. administration’s much-anticipated plan to resolve the Israeli-Palestinian conflict.

But the high-profile meeting in Washington looks set to serve mostly as a sideshow to the two allied leaders’ serious legal problems. The Palestinians have not been consulted on the much-trumpeted deal and have pre-emptively rejected the U.S. proposal.

The Trump-Netanyahu meeting on Tuesday comes as Trump’s impeachment trial continues in the U.S. Senate and the Israeli Parliament holds a hearing to discuss Netanyahu’s request for immunity from criminal corruption charges. For both men, their White House summit will be a welcome diversion.

Vice President Mike Pence announced the surprise invitation for Netanyahu and his top challenger, Israeli politician Benny Gantz, on Thursday in Jerusalem, after addressing an international Holocaust forum.

Netanyahu said he suggested inviting Gantz in a show of unity ahead of a momentous occasion. But late Saturday, Gantz, fearing Netanyahu would use the meeting as an electoral ploy to upstage him, said he would travel to Washington on his own and meet Trump separately. Gantz, a former commander of the Israeli military, will then rush back to Israel for the immunity proceedings in Parliament.

Before taking off Sunday, Netanyahu made no mention of his legal woes. Instead, he said the friendly Trump administration was providing Israel a once-in-a-lifetime opportunity that must be seized.

“We are in the midst of very dramatic political events, but the peak is still ahead,” he said. “I am going to Washington with a great sense of purpose, great responsibility and great chance, and I am hopeful we can make history.”

The plan is expected to be very favorable to Israel, and appears to have little chance of success. The Palestinians, claiming the White House is unfairly biased toward Israel, have already said they won’t accept the plan.

On Sunday, the Palestinian Authority’s Foreign Ministry called for a “clear international declaration” rejecting the plan.

“No single Palestinian would accept this plan, and the Palestinian leadership will defeat it as they have done with similar plans,” said Nabil Abu Rdeneh, spokesman for President Mahmoud Abbas.

The U.S.-sponsored Mideast deal nonetheless could give a lift to Netanyahu, who is running in his third race for re-election in less than a year.

After two inconclusive elections last year, Netanyahu and Gantz are engaged in a tight race ahead of the March 2 vote that once again is seen as a referendum on the long-time Israeli leader.

Gantz has focused his campaign on Netanyahu’s legal problems, saying he is unfit for office. Netanyahu has sought to portray himself as a global statesman uniquely qualified to lead Israel through difficult times. He’s tried to use his close friendship with Trump as a strategic asset.

Two meetings with the president — on Monday and Tuesday — play into Netanyahu’s narrative. It is unclear whether this will benefit him at the ballot box. Trump delivered political favors to Netanyahu during the previous two races as well, only to see his friend fall short of victory.

But Trump’s “Deal of the Century” could give Netanyahu more than anything he has received before. Israeli media reports have said it will offer unprecedented gifts to the hard-line Netanyahu.

“For better or for worse, the announcement of the deal — both its timing and its political ramifications — is a huge achievement for Netanyahu,” wrote Nahum Barnea, a leading Israeli columnist. “Time will tell whether it is his lifeline or his swan song.”