The British home secretary, Suella Braverman, resigned on Wednesday after violating a security guideline. She also expressed "serious concerns" about the course of the government of Prime Minister Liz Truss.

In her resignation letter posted on Twitter, Braverman highlighted her "technical infringement of the rules" for sending an official document from her e-mail address.

She went on to voice alarm about the government of Truss and its backtracking on its promises to the people.

"It is obvious to everyone that we are going through a tumultuous time," she wrote. "Concerns exist regarding the path of this government. Not only have we breached critical promises made to our voters, but I also have grave reservations over this government's commitment to honoring manifesto obligations, such as reducing overall migration levels and halting illegal migration, especially the perilous small boat crossings."

In her letter to Braverman, Truss stated, "I acknowledge your resignation and respect your decision. It is essential that the ministerial code and Cabinet confidentiality are upheld."

According to Downing Street, former transport minister Grant Shapps will succeed Braverman as home secretary.

Five days before Braverman's departure, Kwasi Kwarteng resigned from his position as chancellor of the exchequer after the mini-budget he delivered last month caused market instability and a steep drop in the Conservative Party's poll rating.

Controversial debt-funded tax cuts in the mini-budget have been blamed for the British pound's 37-year low against the U.S. dollar, as well as an increase in the cost of government borrowing and mortgage rates.

Jeremy Hunt, his successor, has repealed nearly all of the announced tax cuts and loosened the government's restriction on rising energy prices. With the reversal of her economic policy and the departure of Kwarteng, Truss's premiership is viewed as increasingly untenable.

In an interview with the BBC on Monday, Truss apologized for going "too far and too fast" with economic plans and accepted responsibility for "the mistakes that have been made" in her first weeks as prime minister.

The prime minister, who has only been in power for six weeks, committed to remain in office and lead the party into the next general election. Earlier in the day, during the weekly Prime Minister's Questions in Parliament, Truss stated, "I am a fighter and not a quitter."