Mark Harper predicts the Democratic Unionist party would end up defeating the pact to support the minority government. Hey what Tory Chief Whip until Mrs. May became PM in 2016 and left him out of government but had this week remaining publicly supportive. Today he announced he wants to rebel for the first time in 13 years as to MP when the Commons votes on the deal next Tuesday, unless the PM promises to get the Irish "backstop" proposal removed.
It makes him one of at least 104 Tories from both sides of the European Union.
His / her / its particular concern is the "backstop" that would keep the whole UK in the EU customs union.
He said it would leave the EU in charge, and could have been divorced in Northern Ireland trading with those in the rest of the UK.
It was so useless since the EU, UK and Ireland were all "hard border", so it was "cripple" Britain's negotiating power ended with a "very bad" EU trade deal lasting decades.
No amendments or words added to the motion for next week's vote would solve the problem, he insisted.
Mrs May must be ready to tell Brussels.
If she did somehow win the vote next week it could destroy her alliance with the DUP.
He said, "It would be that the relationship between our DUP allies and the PM would be broken beyond repair.
"What we saw yesterday when we were defeated three times in this House would be a state of affairs.
"We would be in office but unable to govern our country effectively."
He therefore dismissed the government was ready to pay the EU £ 39billion as part of the legally binding terms and conditions, which are to be hammered out in future talks.
Mr Harper told the House, "I regret being put in a position where I am in a state of solemnity.
"But it's important in politics that we keep our promises."