Small business minister Andrew Griffiths, formerly Prime Minister Theresa May's chief of staff, said he had stepped down Friday, as the Sunday Mirror newspaper published details of his chats with the two women.
The MP sent the women USD 950 in return for explicit pictures and videos. He asked them to tie each other up, among other requests.
"I am deeply ashamed at my behaviour which has caused untold distress to my wife and family, to whom I owe everything, and deep embarrassment to the prime minister and the government," he said in a statement.
"I tendered my resignation as parliamentary under secretary of state for small business on Friday.
"I do not seek to excuse my behaviour and will be seeking professional help to ensure it never happens again.
"In time I hope to earn the forgiveness of all those who put their trust in me and that I have let down so terribly." Pending an investigation by the Conservative Party, he will sit in parliament as an independent, though he said the government retained his "full support".
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