[On Boris Johnson] Nobody could find a way around the problem of the prime minister, just like a shopping trolley, smashing from one side of the aisle to the other.
Source, in full
Speaking at a House of Commons hearing inquiring into the government's handling of the COVID pandemic, as cited in Heather Stewart and Peter Walker "Dominic Cummings says Boris Johnson 'unfit for job' of PM amid Covid crisis", The Guardian (26 May 2021)
Notes from Wikiquote
It was a joint meeting of the Commons Health and Science committees.