"Refuses to accept."
“Now Varadkar was able to do that,” Clarke continued, “confident the [EU] 28 would be all right, because what he shook hands on was what the EU had already agreed to offer Theresa May 12 or 18 months before. It was quite obvious from what Johnson said afterwards that he hadn’t understood what he was agreeing to. He had not recognised it as the original EU proposal. He still refuses to accept that he signed up to a customs union down the Irish Sea.”
And he keeps lying about it.