Speaking in parliament, Ahmadinejad said, "We will resist oppressors and try to correct the global discriminatory mechanisms in order to benefit all the nations of the world."
As he sworn in as Iran's president, protests were broken up by riot police using pepper spray. A Supporter of Ahmadinejad was arrested in clashes as people gathered outside parliament and in squares across Tehran.
Meanwhile, President Barack Obama, Gordon Brown and the leaders of France, Italy and Germany have all decided not to congratulate Ahmadinejad on his re-election.
Mr Ahmadinejad said told parliament he was not awaiting congratulation messages from Western leaders. “We heard that some of the Western leaders had decided to recognise but not congratulate the new government... Well, no one in Iran is waiting for your messages."
At least 20 people have been killed since the Jun12 election and over 2,000 others have been arrested. At a mass trail on Saturday, Aug 1 several prominent figures, faced charges for acting against national security by agitating post-election unrest.