British Defence Secretary Michael Fallon quit the government Wednesday, stepping down from ministerial office in a developing scandal over sexual harassment at Westminster.

"A number of allegations have surfaced about MPs in recent days, including some about my previous conduct. Many of these have been false but I accept that in the past I have fallen below the high standards that we require of the armed forces that I have the honour to represent," Fallon wrote in a resignation letter to Prime Minister Theresa May.

Fallon, who intends to remain an MP, had apologised this week for putting his hand on the knee of political journalist Julia Hartley-Brewer.

Appearing on television, she said she did not think Fallon's cabinet resignation was based solely on the 2002 incident.

"I'm assuming there are more allegations to come," she told Sky News. "I doubt very much it's because of my knee and if it is I think that's really mad and absurd and crazy."

Fallon did not directly respond when asked by the BBC whether he was worried more stories were about to come out regarding his behaviour.

"The culture has changed over the years, what might have been acceptable 15, 10 years ago is clearly not acceptable now," he told the British broadcaster.

- Government under pressure -

May has called for rules on MPs' behaviour to be toughened and has requested a meeting next week with other party leaders, following the emergence of several allegations of sexual harassment at Westminster.