THE First Minister has hit out at the Prime Minister's leadership and has accused her of "trying to run down the clock" by making "undeliverable promises to hardline Brexiteers and offering tawdry, half-baked bribes to Labour MPs".

Nicola Sturgeon added that the PM's "one note of consistency in all of this has been contempt for Scotland".

Sturgeon launched the scathing attack on Theresa May's stewardship over Brexit while kicking off a debate at Holyrood.

READ MORE: Scotland and Wales join forces to reject PM's Brexit deal

Later today, in a first since devolution 20 years ago, the Scottish Parliament and the Welsh Assembly will vote simultaneously on a motion declaring opposition to the EU divorce deal agreed by the UK Government.

Sturgeon said the PM was showing "no decisive leadership", adding: "Instead of doing the right thing and ruling out a no-deal exit at any stage, she insists on freewheeling the car ever closer to the cliff edge.

READ: Nicola Sturgeon's attack on May's 'consistent contempt for Scotland'

"She is trying to run down the clock, making undeliverable promises to hardline Brexiteers and offering tawdry, half-baked bribes to Labour MPs.

"Her one note of consistency in all of this has been contempt for Scotland. Seemingly, we aren’t even worthy of her bribes – though I think we should take that as a compliment."

Sturgeon continued her attack, noting that the two devolved governments had been "brought together by our dismay – bordering now on despair – at the UK Government’s approach to Brexit".

She added: "As recently as last summer, the Prime Minister confidently told me that by the autumn of last year, not only would we know the terms of exit, we would also know significant detail about the UK’s future relationship with the EU.

"And yet here we are, just 24 days until the UK is due to leave the EU. And still we don’t know if there will be any agreed terms of exit. We don’t know if there will be a transition phase."

MSPs will vote on a motion which states that a no-deal outcome would be unacceptable and calls for an extension to Article 50 to delay the Brexit process.