U.S. President Donald Trump said a new civil nuclear agreement with Saudi Arabia depends on the kingdom normalizing ties with Israel, a condition that could derail a landmark deal his administration finalized just a day earlier.

In a social media post Thursday, Trump also said there would be “no enrichment” of nuclear material. The pact would allow American companies to expand nuclear energy development in a long-coveted market, but it also raised concerns about a lack of guardrails that would prevent Riyadh from enriching uranium to weapons-grade.

Trump said that the agreement “will be approved, but is totally subject to Saudi Arabia joining the very respected and successful Abraham Accords,” referring to his initiative to get Arab countries to formally recognize Israel.