A move to send lawmakers home early - known as proroguing Parliament - would require the formal approval of Queen Elizabeth II.
The ardent European Union advocate explained that the Queen's decision to grant a suspension of parliament "cannot be challenged in law, but the prime minister's advice to the Queen" can be.
He added, "She is then in the midst of a constitutional controversy that no serious politician should put the queen in the middle of".
Former Conservative leader Sir John said it would be "utterly and totally unacceptable" for any British premier to shut down Parliament, and he would seek a judicial review if it happened. "But the prime minister's advice to the Queen can, I believe, be challenged in law and I for one would be prepared to go and seek judicial review to prevent parliament being bypassed".
In one of the clashes, Johnson refused to rule out bypassing Parliament to prevent lawmakers from blocking a no-deal departure from the European Union on October 31.
"Because Boris never answers the questions, we have absolutely no idea what his premiership would be like", Hunt said.
The former Foreign Secretary sidestepped questioning on whether or not he would allow Sir Kim Darroch to remain in his job, during a televised head-to-head debate with Number 10 rival Jeremy Hunt.
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Unfortunately for New Zealand , Williamson's two centuries, in back-to-back games, are the only centuries the team has mustered. ALL ABOUT NEW ZEALAND ●New Zealand have reached the World Cup semi-final on most occasions, along with Australia (8).
Nintendo Switch Lite goes all handheld later this year
In terms of the size of the console, the original Switch measures at 102mm x 239mm x 13.9mm with both Joy-Cons attached. As you might have already guessed, this focus on portability means that it ships without a dock.
Instagram will now ask you to think twice before posting profanities
The company said young people are often "reluctant to block, unfollow, or report " bullies for fear of escalating the incident. The second new feature will offer Instagram users a new way to protect their account from unwanted interactions.
But journalists recalling the leaking of 250 000 State Department cables by Wikileaks nine years ago say diplomats should know the internet can not be confidential. Major's suggestion is important because Parliament has repeatedly signaled its opposition to a no-deal Brexit, but has no obvious way of stopping it.
But he refused to say whether he would keep Sir Kim in post, and instead he told the ITV debate: "It is vital that our civil service is not politicised by ministers leaking what they say".
"I seem to recall that the Brexiteers, led by Mr Johnson, actually campaigned in the referendum for the sovereignty of Parliament..."
"We really can not have our ambassadors chosen by the host government, however eminent those host governments may be", Sir John, who is backing Mr Hunt in the leadership race, told BBC Radio 4's Today programme.
Sterling was trading near its lowest level for more than two years on Wednesday as better-than-expected readings on the economy did little to dispel growing fears of a no-deal Brexit.
But Mr Johnson said it would be "presumptuous" of him to commit to keeping the ambassador on and criticised the leaking of the cables.
"National leaders look first at the interests of the country - not first at the interests of themselves", he said.