The US offials are striving not to let Iran develop its own cryptocurrency. For that purpose, the bill sugesting strict sanctions against Iran's crypto attempts has been lately presented to the US Congress.
The first concerns among the American officials arose back a few months ago. That time, Tehran expressed intentions to create the state-backed crypto that would be similar to El Petro with targeting evasion the US economic sanctions.
The draft bill aimed at restraining illegal financial activities of Iran was submitted by a member of the House of Representatives. The document covers that the US Minister of Finance should report before the Congress regarding the progress of Iran's state crypto project.
Moreover, another member of the parliament expanded the previous proposal with its own measures. Specifically, he believes that the regulators may develop sanctions against the individuals and companies that provide Iran with a help of any kind (financial, technological, etc.) for the development of Iran's coin.
For reference, the USA pulled out of the Nuclear Agreement with Iran – Joint Comprehensive Plan of Action.
As commented US official, Washington left the agreement targeting tougher pressure on Iran, as without JCPOA they have more ways to restrain Iran's activities in the region. The proposed document is said to be one of the measures to block Iran from the global financial community.