Ian Austin has become the ninth Labour MP in a week to quit Jeremy Corbyn's party, claiming there was a "culture of extremism, antisemitism and intolerance".
The Dudley North MP said he was quitting the "broken" party and was "ashamed" of what it had become under Mr Corbyn.
Unlike the eight other MPs who have resigned from the party this week, Mr Austin will not be joining the newly established Independent Group, which contains eight former Labour MPs and three ex-Tories.
In an interview with the Express and Star newspaper he said: "The Labour Party has been my life, so this has been the hardest decision I have ever had to take, but I have to be honest and the truth is that I have become ashamed of the Labour Party under Jeremy Corbyn."
He added that "I could never ask local people to make Jeremy Corbyn prime minister", and said he was "appalled at the offence and distress" the party had caused to Jewish people."