Boris Johnson, the UK’s foreign secretary, resignedtoday in opposition to Prime Minister Theresa May’s proposed Brexit compromise with the European Union.

Johnson said he could not support the compromise, which would have the UK adopt a “common rule book” with the EU regarding standards for food or goods.

News analyst Charlie Sennott joined Boston Public Radio to talk about Johnson's resignation.

Sennott said that Johnson was looking for a “hard Brexit” while Theresa May was working on a “soft” one.

“Soft Brexit is basically saying, we’re going to do this, but we’re going to have to keep the European Union happy as we back out the door,” Sennott said. “Hard Brexit is, the people voted for this thing, we’re going to go forward in a way that we’re going to really break from the European Union to protect our own economy.”

May and her cabinet worked out the deal in Chequers on Friday. Brexit Secretary David Davis and Minister Steve Baker resigned Sunday night.

“Johnson wants ‘hard,’ May is trying to sell ‘soft,’ and she has now got such a divided cabinet,” Sennott said. “She is now looking at the possibility of a no-confidence vote.”

48 members of parliament would have to write letters of no confidence to confront May with this option. Seven cabinet ministers have resigned in the past year.

Sennott says the no-confidence vote isn’t likely, but it is possible.

“It is definitely a possibility all of a sudden that her government could go down,” he said.

Charlie Sennott is a news analyst at WGBH, where he also heads up the GroundTruth Project.