On Johnson's new job title, SNP MSP Tom Arthur said: "Boris Johnson's latest scheme to appoint the next Tory leader as minister of the Union is simply laughable - voters will see this meaningless gimmick for what it is".
"Boris is a great one for rhetoric and bluster, but until we know what exactly is going to happen I don't think anyone in the Brexit Party would make any commitment to any support whatsoever", she said.
"He wants to do a deal".
Johnson also called the current Brexit deal negotiated with the European Union "unacceptable" and set preparations for leaving the bloc without an agreement as a "top priority" for the government.
"Our mission is to deliver Brexit on the 31st of October for the goal of uniting and re-energizing our great United Kingdom and making this country the greatest place on earth", Johnson proclaimed.
Critics claim it keeps the United Kingdom indefinitely tied to the EU's trading rules.
IT is easy to understand the business community's entirely justified frustration over the UK's protracted Brexit fiasco, as the country's new Prime Minister takes office with a salute and a thumbs-up gesture. But Britain's most senior police officer, Metropolitan Police Commissioner Cressida Dick, said there was a link.
The auto industry's supposed abject opposition to Brexit has also been challenged in the last few days.
But details remain scarce about how Johnson's government would alleviate the economic shock if Britain crashed out of the EU's huge free-trading bloc, ripping up decades of agreements regulating everything from aviation to drugs to telecommunications.
A handout photo made available from the Scottish Parliament on March 21, 2017, shows Scotland's First Minister Nicola Sturgeon speaking in the chamber on the first day of the "Scotland's Choice" debate on a motion to seek the authority to hold an indpendence referendum at the Scottish Parliament in Edinburgh.
The two-time Conservative Party leadership loser's appointment is another indication that Johnson's cabinet will lean heavily to the Tories' right flank, given the controversy that has met her past comments on LGBT education, in which she argued "it is right that parents should be able to choose the moment at which their children become exposed" to such teachings.
They stated: "It would be unconscionable for a UK Government to contemplate a chaotic no-deal exit, and we urge you to reject this possibility clearly and unambiguously as soon as possible".
There would be little point in Johnson reintroducing the very same deal for Parliament to vote on. There also is rising speculation that Johnson could call an early fall election in hopes of gaining a majority in Parliament for his plans.
John Penrose said he was leaving his post in the Northern Ireland Office but would keep his role as the Prime Minister's anti-corruption champion.
Has Mr Johnson broken a promise here?
The new prime minister had months previously voted in favour of the backstop, Corbyn said.
"We will win on a manifesto for the whole United Kingdom".