DAVID Mundell’s successor as Secretary of State for Scotland has been named.

Downing Street confirmed the appointment after Mundell was sacked by new Prime Minister Boris Johnson.

Alister Jack, the MP for Dumfries and Galloway, was elected in 2017.

Responding to his sacking, Mundell tweeted: “Disappointed but not surprised to be leaving the Scotland Office after 9 years.

“Will, of course, support the new Government, but as I said to PM this afternoon I will also hold him to account on his commitments to the Union.

“Hope there’s still room on the backbenches!”

READ MORE: Scottish Secretary David Mundell sacked from government

Jack's appointment follows a frenzied day of Cabinet re-shuffling.

Sajid Javid was named as Johnson's Chancellor, with Brexiteers Priti Patel and Dominic Raab returning to the Cabinet as Home Secretary and Foreign Secretary respectively.

Raab will also be First Secretary of State, effectively making him Johnson's Deputy PM, while Michael Gove becomes Chancellor of the Duchy of Lancaster and Steve Barclay remains as Brexit Secretary.

Ben Wallace has been named Defence Secretary while Liz Truss has become International Trade Secretary.

The appointments came after Johnson wielded the axe, with more than half of May's Cabinet either quitting or being sacked.

Jeremy Hunt, Johnson's rival in the Tory leadership race, left the Government after refusing to be demoted from foreign secretary.

Penny Mordaunt and Liam Fox, prominent backers of Mr Hunt, were among the first to be sacked as Johnson carried out a radical reshaping of the Cabinet.

Other ministers shown the door included Damian Hinds, Greg Clark, David Mundell, Karen Bradley, James Brokenshire, Jeremy Wright and Mel Stride.

Before Johnson even took office, Philip Hammond quit as chancellor, David Gauke resigned as justice secretary and Rory Stewart left his post as international development secretary.

David Lidington, May's de facto deputy prime minister, left office at the same time as his boss while Chris Grayling resigned as transport secretary.