Tony Blair has reportedly resigned as envoy to The Quartet group of Middle East nations.
The news was reported in a tweet by the Associated Press, which claimed an official had told the agency the former UK Prime Minister would stand down.
Speaking ahead of his formal resignation, Blair told officials he had written to the UN General Secretary Ban-ki Moon to step down from his post.
The former Prime Minister has served as a peace envoy for the group, made up of the UN, the US, the EU and Russia, for eight years.
He is thought to be stepping down due to an increasingly strained relationship with Palestinian authority figures.