This has resulted in the Daventry MP becoming the Parliamentary Under Secretary of State, replacing Mr Baker.
The letter by which Boris Johnson resigned as Foreign Secretary was pored over and dissected by political analysts and journalists, but for cycling campaigners there was one passage that jumped it, with the former Mayor of London claiming that European Union rules prevented him from introducing safer lorries to the city's street.
US President Donald Trump hailed Britain's Boris Johnson as a friend of his Tuesday after he quit Theresa May's government and said he may speak to the former foreign secretary in the coming days.
He added, "This is a time when the world is looking at us as a country, wondering what type of country we are going to be in a post-Brexit world".
May responded that she was "sorry and a little surprised" by his decision but said she accepted it was necessary "if you are not able to provide the support we need to secure this deal in the interests of the United Kingdom". He also said he will "step up the preparations for "no deal" in case the spirit of pragmatism and compromise that we have extended is not reciprocated".More news: Hosts Russia level at 1-1 with Croatia at halftime
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"As I said then, the Government now has a song to sing".
May's office said Geoffrey Cox would be the new attorney general.
Earlier, May defended her Brexit plan to lawmakers in the House of Commons, with Johnson absent from his usual place on the Conservative front bench. That plan is now in tatters and her political future appears uncertain.
In his resignation letter, Johnson wrote: "Brexit should be about opportunity and hope". In her statement to members of Parliament, May acknowledged the splits in her government and the departures of her ministers.
Julien Hoez, a policy analyst with Vocal Europe, an online news service, believes the prime minister is going to be safe from a leadership challenge.
Jeremy was a pro-Remain voter in the Brexit referendum and he has a very strong background in law. "Mr Speaker, this is the right Brexit", she said to jeers from the opposition Labour Party.