Johnson described Scottish devolution as former UK Prime Minister Tony Blair’s biggest mistake, the report added.

Scottish First Minister Nicola Sturgeon took to Twitter in response to Johnson’s reported comments.

“Worth bookmarking these PM comments for the next time Tories say they’re not a threat to the powers of the Scottish Parliament – or, even more incredibly, that they support devolving more powers,” her tweet said.

The only way to protect and strengthen the Scottish Parliament is with independence, she added.

Under UK’s delicate constitutional balance, semi-autonomous parliaments and governments in Scotland, Wales and Northern Ireland known as the devolved administrations have powers over areas like education, health, policing and justice.

Scottish Conservative leader Douglas Ross tweeted, saying devolution is not a disaster.

“Devolution has not been a disaster. The SNP’s non-stop obsession with another referendum – above jobs, schools and everything else – has been a disaster,” his tweet said.

During Johnson’s call with 60 Conservative MPs, he also promised to pump billions more into infrastructure, telling they will get the largest financial commitment to infrastructure in 70 years, the report said.