Britain's Boris Johnson will make his first visit to Scotland as prime minister on Monday, his office said, as his Conservative Party's leader there said she would refuse to support a no-deal Brexit.

Johnson took office on Wednesday with a pledge to deliver Britain's exit from the European Union by Oct. 31 "no ifs or buts" and the government is ramping up preparations for "no deal" — something some senior politicians have warned could make the break up of the United Kingdom more likely.

Scotland rejected independence by a 55-45 percent majority in 2014 but then voted to stay in the EU at the 2016 Brexit referendum, fueling calls for a second independence vote from those who argue it is being taken out of the bloc against its wishes.