The first round of Brexit negotiations concluded on Thursday as Michel Barnier warned of several “divergences” between the two sides. Despite the warning from the EU’s top negotiator, he still said a deal could be possible by the end of the year.
However, Mr Johnson has been warned by Simon Usherwood, professor of politics at Surrey University, he could face the “same issue” as his predecessor.
Although the Prime Minister has a greater majority in the Commons, ultimately he could face a “bumpy road” going forward if he fails to maintain the support of his backbench.
Mr Usherwood said: “He could face the same issue Theresa May had.
“She had space with negotiations but she had to come back to Parliament.
“Boris may have more flexibility because there’s less attention but he will have to bring a deal back.
“If he has not kept his backbench together, it might be a bumpy road.”
Following his overwhelming election victory, Boris Johnson now has a majority of 74 seats in the Commons.
With that majority, he has a stronger position to pass future legislation.
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The EU also warned the UK must agree to an adequate proposal on fisheries, the role of the European Court of Justice and the overall nature of the agreement.
Mr Barnier said: “There are many divergences, and they are very serious divergences which is probably quite natural after the first round of negotiations.
“We had agreed with the UK that we would want to prevent on both sides, distortions in trade and prevent unfair competitive advantage.
“The UK does not wish to translate those undertakings into a common agreement and they do not want appropriate mechanisms on either side to ensure the respect of it.
“While we agree on preserving high standards, my questions is why not commit to them formally?
“It is a question of trust.”
He also warned the UK there would be “a lot of consequences” for the UK if it walked away from a deal.
The transition period for the negotiations ends on December 31, 2020.
The deadline to extend the transition ends on July 1, 2020 but Mr Johnson has insisted he will not apply to do so.
If an agreement is not reached by the end of 2020, the UK will leave without a deal.