Iran's paramount political leader has reportedly written a top secret letter to President Obama.

According to the Wall Street Journal, Supreme Leader Ayatollah Ali Khamenei was responding the president's calls for improving relations between the U.S. and Iran.

In October, Obama raised the possibility of cooperating in the fight against ISIS if a nuclear deal was reached.

The Iranian cleric's response was respectful, but noncommittal, an Iranian diplomat reportedly said.

The White House has not confirmed the existence of the letter. reported:

U.S. officials told the paper that a letter sent in Obama’s first term outlined 60 years of abuses the supreme leader says the U.S. committed against the people of Iran.

One White House official confirmed to the Wall Street Journal that Obama received the letter in 2009.

The letter signified the thawing of frozen ties between the U.S. and Iran. However, the effort to knock the wall down between the two counties comes at a crossroads as the U.S. set a deadline to yield an agreement in its nuclear negotiations or Washington will take steps to deny the country any possibility of making a nuclear bomb.

Obama has said the breakdown in negotiations could fuel even more instability in the Middle East and undercut U.S. efforts to combat ISIS militants in Iraq and Syria, whom Iran is also waging war against.

Iran and the U.S. have previously failed to reach an agreement in the nuclear discussions. When talks broke down last, Khamenei said he would not approve a “bad deal.”

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