He's directly stated - and forcefully repeated his statement - that the Dr Nichol, the expert who worked on the health outcomes of a No Deal Brexit for Yellowhammer - is as bad as Wakefield.
You know, the guy who was paid being paid to show that vaccines cause autism, and who paid parents to take illegal samples of their kids, was struck off the medical register as a result, and has single handedly caused the greatest undermining of trust in vaccination that has ever occured, to the extent where the likes of measles are making a comeback in this country after years of being basically not an issue.
The Commons Leader said: "I'm afraid it seems to me that Dr David Nichol is as irresponsible as Dr Wakefield.
"What he had to say - I will repeat it - is as irresponsible as Dr Wakefield, in threatening that people will die because we leave the European Union.
"What level of responsibility was that?" he added.