Lord Ahmed - who has resigned from the Labour Party - said he was "very disappointed" with the way he had been treated by Labour.
"I don't want to appear before any kangaroo court where the rules of justice have been denied. All I want is any evidence in front of me so I can look at it and defend myself. I can't defend myself if there is no evidence produced."
"I don't want my friends in the Labour to think that I have walked away but the rules of justice demand it. It's very unfortunate."
Lord Ahmed said he had "never been anti-semitic" and had "unreservedly apologised" for any offence caused to the Jewish community.
He added his "heart" is still with the Labour Party.
The Rotherham peer was due to face a hearing over allegations he made anti-Semitic comments in a TV interview.
More top news
Jon Mitchell has the late weather forecast
I have one new certainty - it is that nothing will ever be the same again.
We look at the implications of the EU referendum result on various aspects of life in Britain.