Addressing Sir Keir during PMQs, Mr Johnson said: “When it came to reopening schools, he stayed silent because he didn’t want to offend his anarchist union bosses.
“When left-wing anarchists tried to destroy the freedom of the press, he wouldn’t break the silence because he didn’t want to offend them.
“When it comes to sticking up for our UK internal market and for delivering on the will of the British people, one of the most important issues facing us today, he’s totally silent on this bill that totally obsesses his backbenchers.
“Once again, he stood on his tongue, has nothing to say at all about that subject today because he doesn’t want to offend the huge number of his backbenches who want to overturn the decision of the people and want to take us back into the EU which is, of course, what he wants to do himself.”
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Mr Johnson continued: “This Government gets on and takes the tough decisions on behalf of the British people, delivering thousands of jobs through our kickstart scheme, a record-breaking investment in affordable housing.
“And we are getting on with all our work, working with the British people and working with the Right Honourable Gentleman, if he would only do so, to get coronavirus defeated and to take our country forward.
“We take the tough calls, all he does is sit on the sidelines and carp.”
The comments came after Sir Keir focused all of his questions during Wednesday’s PMQs on the coronavirus crisis without questioning the proposed changes to the Northern Ireland protocol the Government has tabled.
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The Prime Minister has also been warned attempts to override the withdrawal agreement could affect UK attempts to secure new trade agreements with countries outside of the EU.
Theresa May on Tuesday challenged Northern Ireland Secretary Brandon Lewis questioning how the Government is planning to protect Britain’s standing on the international stage should it go ahead and override the protocol.
Ms May said: “”The United Kingdom Government signed the withdrawal agreement with the Northern Ireland protocol.
“This Parliament voted for the withdrawal agreement into UK legislation. The Government is now changing the operation of that agreement.
“Given that, how can the Government reassure future international partners that the UK can be trusted to abide by the legal obligations of the agreements it signs?”