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Boris Johnson has been accused of not understanding his Brexit deal or what it means for businesses in Northern Ireland.
Labour criticised him after he briefed Conservative members on Thursday.
The PM said firms could “bin” customs forms because there would be “no barriers of any kind” to trade crossing the Irish Sea.
But that contradicts what Brexit Secretary Steve Barclay said last month about customs declarations for goods.
Mr Barclay said businesses in Northern Ireland would have to submit customs declaration forms after he initially denied that was the case.
On Friday, Labour’s Shadow Brexit Secretary Sir Keir Starmer tweeted that Mr Johnson’s remarks to Conservative Party members