According to the U.S. business publication the Wall Street Journal, in his letter Obama emphasized that any kind of cooperation would be possible, provided Iran signed a permanent agreement on its nuclear program by November 24, Radio Liberty reported.
White House spokesman Josh Ernest refused to comment on the reports, saying that U.S. policy towards Iran "has remained unchanged." Regarding the issue of fighting the Islamists, he also added any such cooperation would not include military cooperation or the exchange of secret information with Iran.
Meanwhile, the speaker of the House of Representatives, Republican John Boehner, said the US should not involve Iran the fight against the Islamic State military group.
Earlier in the week, after Tuesday’s mid-term elections in the United States, the Republicans strengthened their position in the House of Representatives and gained a majority in the Senate.