Ex-Labour MP George Galloway has told his new east London constituents he will hound Tony Blair out of office.
Mr Galloway was expelled from Labour and helped set up Respect
The newly-elected member for Bethnal Green and Bow was touring the area in an open-top bus, after ousting the previous incumbent, Labour's Oona King.
The Respect MP told the crowds: "It is one of my first missions to bring him [Tony Blair] in front of a court in The Hague and behind bars."
Mr Galloway won the seat by 823 votes in Thursday's general election.
"We are increasingly in a presidential system and that means the president is personally responsible and the buck stops there," he said.
"I doubt if there are many people in the country who do not think that he is a liar."
Mr Galloway - who was expelled from Labour for his anti-war stance - said his first attack would come in the Queen's Speech debate.
"I will have plenty to say about Mr Blair - assuming he's still there. I don't think he is in for a third term."
Mr Galloway was joined by more than 100 supporters on his victory "Sunshine Tour" to thank the people who voted him in.
He said his victory had struck a decisive blow against New Labour and promised "fireworks" for the future.
But the 50-year-old pledged not to stand at the next general election in Bethnal Green and Bow because the people needed an MP of their "own origin".
He said he may stand in another constituency or for the European Parliament.
"I am younger and fitter than Mr Blair and will certainly be continuing in politics," he said.
His pledges to his constituents include campaigning for better housing, schools, public areas and action on youth unemployment.
"East London is the 'Cinderella' of our capital city and it has been grossly abandoned by both the major parties while in government," he said.
"There is a saying that 'it's a squeaky wheel that gets oil' and the East End did not just squeak on Thursday, it roared."