AFP: The United States said Monday "the door is still open" for Iran to meet world demands on its nuclear aims, but warned it was discussing with allies the "next steps" which could include sanctions. The Obama administration's signal of more pressure on the Islamic republic came after Tehran dismissed a US-set deadline of December 31 and issued the West a one-month "ultimatum" to accept a counter-proposal for a nuclear fuel swap. "The door is of course still open for Iran to do the right thing and live up to its international obligations," said Bill Burton, a White House spokesman.