During an interview the defeated MP lashed out at the Government for being “fragile, incompetent and internally divided” while skewering Jeremy Corbyn for being stuck in a “time warp”.
He stated: “They (Labour) should be worried, a half decent leader of the opposition would kill this Government in a week.
“It is one of the most fragile, incompetent, internally divided British Governments in living memory and yet the Labour Party is still basically level-pegging with the Conservatives.
“I mean that is how bad they are doing. Jeremy Corbyn is still reliably rated as a less desirable Prime Minister by the British public, and I keep hearing he’s doing so well.
“It is just astonishing that the modern Labour leader is stuck in this kind of weird time warp in the 1970s you know where he is kind of repeating all of these benile cliches about the single market being a kind of market for big bosses.”
Mr Clegg continued to dig into the Labour leader, labelling his performance as “shameful” and a “total abdication of responsibility”.
During a Politico podcast interview, he said: “I think it’s shameful. I think it is a total abdication of responsibility and leadership and if he persists with what he and John McDonnell keep saying they want to do, which is to support a Tory Brexit, a hard Tory Brexit it will represent the greatest betrayal of progressive values in British politics in the modern era.
“I think he will reap an absolute whirlwind of opprobrium for doing so and I think it’s just kind of pathetic that the Labour Party which has always believed that European democracies and progressive democracies work most effectively when they work together.”
The former Liberal Democrat leader continued to blast Mr Corbyn and his party for “sitting on their hands” and hoping to “waft effortlessly into Number 10”.
He went on: “He could make such a difference, he really could make such a difference if he was to actually lead opinion rather than sit there and just observe it.
“I think part of what’s going on is that they’ve convinced themselves that all they need to do is kind of sit on their hands and let the Conservatives screw things up and they’ll waft effortlessly into Number 10.
“Well I’ll tell you because I’ve done the rounds in politics, you don’t just waft into positions, you have to fight for it and the British electorate is not just going to allow Jeremy Corbyn to sort of sidle into Number 10 without actually saying what he believes.
“The real story in British politics is why on earth is Labour not doing better.”
The defeated MP capped off his attack on Labour by explaining the benefits the European Union offers in a seemingly desperate last-gasp effort to reverse Brexit.
He stated: “It is now a much more sophisticated arrangement which guarantees worker rights, consumer rights, environmental standards and I just beggars belief that he and McDonnell still keep repeating these tedious, out of date, ill-informed accusations from the kind of nostalgic left.”