David Cameron is in Scotland to hold talks with Nicola Sturgeon about new powers for her government following the SNP's landslide election victory.
The pair are expected to clash over plans for greater devolution for Scotland, with the Prime Minister stating ahead of the meeting that he intended to implement pre-election proposals.
These include giving Scotland control over 60% of its spending and the power to set rates and bands of income tax.
However, Ms Sturgeon said she will press for even more powers for Holyrood, including over the minimum wage and employment law.
She will argue that it would be "inconceivable" for the UK Government to ignore the democratic will of Scottish people after the pro-independence party won almost every Scottish seat.
Mr Cameron has promised to include a new Scotland devolution bill in the first Queen's speech on May 27.
Mr Cameron said he was "remaining true" to the promise to implement the all-party Smith agreement that he said would make Scotland "one of the powerful devolved parliaments in the world."
Ms Sturgeon said that she has already made it "crystal clear" that the SNP's victory in the general election means that Mr Cameron cannot expect things to be "business as usual" at Westminster.
She described the Smith agreement as "a good starting point".
Ms Sturgeon has dismissed claims in some reports today, which quote a senior SNP source in Westminster, that the party would push ahead with a referendum without the Prime Minister's permission.
Her representative said: "These claims are totally wrong - there are no such plans.
"The position is crystal clear: the General Election was not a mandate for another referendum. And there will only be another referendum if and when the people of Scotland back such a proposal at a Scottish Parliament election."