WASHINGTON>> President Donald Trump on Thursday appeared to add a condition to the newly signed agreement with Saudi Arabia for a civilian nuclear program, saying the deal would require the kingdom to normalize its relations with Israel through the Abraham Accords.

When the deal was announced Wednesday, neither the U.S. Energy Department nor the Saudi government made any mention of it being contingent on the kingdom’s relations with Israel.

Trump’s social media post a day later asserting that the agreement was subject to the Saudis joining the accords was unexpected and almost certain to complicate any final approval. The accords approved in 2020 expanded the number of Arab and Muslim-majority nations with diplomatic ties with Israel.

Getting Saudi Arabia to join would be a monumental diplomatic achievement. The Saudis previously have made clear that normalizing relations with Israel would first require the establishment of a clear path for Palestinian statehood. Israeli Prime Minister Benjamin Netanyahu has rejected the idea of Palestinian statehood as being untenable for his country’s security.

The Republican president also said the pact does not allow for enrichment of uranium. Nonproliferation experts have raised concerns that the deal fails to include guardrails to prevent enrichment of uranium to weapons-grade levels.

Trump said the agreement “will be approved but is totally subject to Saudi Arabia joining the very respected and successful Abraham Accords.”

He added that the U.S. “is not opposed to Civil (Non-Enriched) Nuclear Facilities.”

Netanyahu’s office in a statement applauded the prospect of Saudi Arabia joining the accords as a “historic leap forward for peace in the Middle East.” The statement made no mention of the deal to bolster Saudi Arabia’s civil nuclear program.

Trump has sought to build on the accords, which also formalized commercial ties between Israel and some Arab and Muslim-majority nations. Saudi Arabia is the most important Arab power in the Middle East, and Trump believes the kingdom joining the accords is critical to establishing long-term stability in the region.

The new nuclear deal is expected to last 30 years and involve U.S. firms in the program’s development. The agreement could allow for the building of a uranium-enrichment facility in Saudi Arabia after a joint U.S.-Saudi study, according to a person familiar with the matter who was not authorized to comment publicly and spoke on the condition of anonymity.

The pact is to be submitted to Congress for review, according to the U.S. and Saudi governments.

The deal does not include the International Atomic Energy Agency’s “additional protocol,” which would allow for more monitoring, inspections and verification, according to a second person familiar with the agreement.

The oil-rich kingdom’s Energy Ministry on Wednesday said the agreement bolsters “efforts to diversify energy sources, advance cutting-edge technologies, and expand opportunities for cooperation and investment in ways that serve the mutual interests of the two friendly countries.”

Enrichment is not an automatic path to a nuclear weapon — a nation also must master other steps, including the use of synchronized high explosives, for instance. But it does open the door to weaponization, which has fueled concerns over Iran’s program.

The White House and Saudi Arabia have not made public the text of the nuclear cooperation agreement, known as a “123 agreement,” alongside what the Trump administration described as a “bilateral safeguards agreement” that was signed Wednesday by U.S. Energy Secretary Chris Wright and Saudi Minister of Energy Abdulaziz bin Salman.

But it already faces scrutiny from Congress, some Israeli officials and nuclear experts.

As details of the deal emerged Wednesday, opposition on Capitol Hill and elsewhere began to snowball, with Republicans and Democrats both questioning the wisdom of the agreement.

Then on Thursday, Trump abruptly announced that the deal is contingent on the Saudis joining the accords.