The White House struggled Tuesday to clarify widespread confusion over whether and how the Obama administration is trying to facilitate Iranian access to the U.S. dollar, a move some say would circumvent sanctions against the country.

Presidential press secretary Josh Earnest told reporters he would "do my best to try to clarify a little here," but still referred reporters to check with the Treasury Department for further follow-up.

"What I can say at least specifically that the U.S. is not preparing to reinstate so-called "U-turn" authorizations … emanating from Iran," he said. He added that "reports that the U.S. is considering allowing Iran to get access to the U.S. financial system are false."

A U-turn transaction usually refers to a banned financial transaction done by U.S. bank for the benefit of a sanctioned country such as Iran, through an offshore bank. It was a practice the U.S. government had previously allowed with Iran but it was banned in 2008 as part of sanctions to try to discourage Tehran's development of a nuclear weapon.

Earnest, however, was short on the specifics of what the U.S. is allowing to help facilitate dollar-dominated business transactions and how they would implement those changes.

"What we are interested in doing, what has been true for almost a year now … we are making sure that the U.S. and the reset of the international community lives up to commitments it's made" in the Iran nuclear agreement to lift sanctions and allow more international investment in Iran.

Earnest said Iran has lived up to the commitments it made in the nuclear deal, such as rendering their plutonium reactor harmless, even though it is violating other international agreements barring it from launching ballistic missiles.

"Because Iran has followed through on all those steps," he said the international community must live up to its commitments laid out in the deal as well, including allowing non-U.S. business investment in Iran.

Republicans in Congress have accused the Obama administration of engaging in deceptive language and practices in an effort to ease financial sanctions against the country.

In a Tuesday morning hearing of the Senate Foreign Relations Committee, Sen. Bob Corker, R-Tenn., pressed Thomas Shannon, undersecretary of state for political affairs, to clarify the confusion over whether the Obama administration plans to help facilitate Iran's access to the U.S. dollar.

Unsatisfied with the answer, Corker said the GOP would pass legislation formally block Iran's access to dollar-based transactions and the U.S. financial system.