WASHINGTON (AP) — The Biden administration says it remains open to talks with Iran over the 2015 nuclear deal despite Tehran’s rejection of an EU invitation to join a meeting with the U.S. and the other original participants in the agreement.

President Joe Biden has said repeatedly that the U.S. would return to the deal that his predecessor, Donald Trump, withdrew from in 2018 only after Iran restores its full compliance with the accord.

“Considering US/E3 positions & actions, time isn’t ripe for the proposed informal meeting,” Iranian foreign ministry spokesman Saeed Khatibzadeh said on Twitter. He referred to the so-called E3, which comprises Britain, France and Germany.

“Remember: Trump failed to meet because of his ill-advised ‘Max Failure,'” he said. “With sanctions in place, same still applies. Censuring is NOT diplomacy. It doesn’t work with Iran.”

A senior administration official said the U.S. was “disappointed” in the rejection but was flexible as to the timing and format of the talks and saw Iran’s decision to snub the European invitation as part of the diplomatic process.

The official was not authorized to discuss the matter by name and spoke on condition of anonymity.