Cheney accuses Democrats of 'rewriting history'
"The president and I cannot prevent certain politicians from losing their memory, or their backbone - but we're not going to sit by and let them rewrite history," he said.
Democrats have exploited rising anti-war feeling in the US in recent weeks and accused the administration of manipulating intelligence to justify the war and leaking classified information to discredit critics.
But the White House has launched an aggressive counter-attack, accusing Democrats - many of whom voted in favour of the invasion in 2002 - of "rewriting history".
Mr Cheney called Democrats "opportunists" who were peddling "cynical and pernicious falsehoods" to gain political advantage while American soldiers died in Iraq.