London (CNN) The UK's finance minister Philip Hammond has vowed to resign if Conservative Party leadership hopeful Boris Johnson becomes the next prime minister, as expected.

Asked by the BBC's Andrew Marr if he thought he would be sacked this week, Hammond replied: "No, I'm sure I'm not going to be sacked because I'm going to resign before we get to that point."

"Assuming that Boris Johnson becomes the next prime minister, I understand that his conditions for serving in his government would include accepting a no-deal exit [of the European Union] on the 31st of October, and it's not something I could ever sign up to.

"It's very important that a prime minister is able to have a chancellor who is closely aligned with him in terms of policy and I therefore intend to resign to Theresa May before she goes to the palace to tender her own resignation on Wednesday," Britain's finance minister, known in the UK as Chancellor of the Exchequer, added.

May will step aside when the winner of the ongoing Conservative leadership contest is announced on Tuesday, bringing to an end a three-year tenure that will be defined by her inability to take Britain out of the EU.

Read More