Earlier on Tuesday Prime Minister Theresa May's government said it had agreed a draft text of the Brexit withdrawal agreement with Brussels, which May will present to her senior ministers on Wednesday.
Johnson, who quit as foreign secretary over May's handling of Brexit, said he had not seen the full details but it had been widely trailed. "It is vassal state stuff," he said.
"It is utterly unacceptable to anyone who believes in democracy.
"For the first time since partition Dublin under these proposals will have more say in some aspects of the government of Northern Ireland than London. I don't see how you can support it." (Reporting by Kate Holton and Andrew MacAskill;)
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