Iran's top negotiator dismissed President Donald Trump's claim that billions of dollars in unfrozen Iranian assets will flow to American farmers, casting the proposal Thursday as a fiction and reopening a public rift over the terms of the U.S.-Iran framework that paused the war.

Iranian Parliament Speaker Mohammad Bagher Qalibaf, who is leading Tehran's negotiating team, took to X with a rebuke.

"America falsely claims our unfrozen assets will buy their agriculture. Interesting. The only crop we're harvesting is what you planted: decades of mistrust. It's organic, abundant, and homegrown. But apparently the US only exports GMO soybeans, broken promises, and trash talks," he wrote.

Qalibaf's response came days after Trump told U.S. farmers they would see a windfall under the memorandum of understanding signed last week, which reopened the Strait of Hormuz and set a 60-day window for Tehran to resume oil sales while talks continue.

Writing on Truth Social on Tuesday, Trump said released funds would move "into escrow, controlled by the U.S.A., and will be used for the purchase of food and medical supplies, exclusively from the United States, including Corn, Wheat, and Soybeans from our great American Farmers."

Treasury Secretary Scott Bessent reinforced the pitch on Wednesday on CNBC's "Squawk Box," telling viewers that "a very large percentage" of any released funds would go to U.S. foodstuffs and medicines under Treasury oversight.

Vice President JD Vance, speaking Monday after the Lake Lucerne talks in Switzerland, said unfrozen money would "make American farmers richer and feed the Iranian people."

Qalibaf told reporters in Baku earlier this week that the MOU contains no clause obligating Tehran to buy U.S. commodities, and Foreign Ministry spokesman Esmail Baghaei said any agricultural purchases would turn on "prices and quality," not terms set in Washington.

Qalibaf on Monday put the figure for frozen assets at $12 billion.

The details of the arrangement remain unclear.

Sanctions experts say Washington cannot easily compel foreign banks holding Iranian funds to route them through U.S. agricultural channels, though Treasury could threaten secondary sanctions on banks that refuse.

Richard Nephew, a former Iran sanctions architect now at Columbia, said by email that the U.S. can try, "but banks do not have to comply."

Trump faces pressure from Republican lawmakers skeptical of the pause and from a farm sector battered by tariff fights with China.

Whether the escrow framework survives contact with Iranian resistance, foreign banks, and Congress will shape the next phase of talks.

Secretary of State Marco Rubio, speaking Thursday in Manama, warned that if Tehran fails to honor the Switzerland commitments, "the president has a lot of options at his disposal," including sanctions.