Priti Patel had two further unauthorised meetings with Israeli political figures, a revelation that will increase pressure on the Prime Minister to sack her.
It is understood Ms Patel met Israel’s public security minister Gilad Erdan in Parliament on 7 September and foreign ministry official Yuval Rotem in New York on 18 September.
Theresa May was reportedly told about the New York meeting on Monday but only learned about the meeting with Mr Erdan on Tuesday.
Ms Patel, the International Development Secretary, has already been forced to apologise for about 12 undisclosed meetings held during a family holiday in the country in August.
Among those she met were politicians, businesses and charities and Prime Minister Benjamin Netanyahu.
When conducting official Government work overseas, ministers are supposed to inform the Foreign Office.
But Ms Patel has admitted she gave no advance notice of her trip.
Ms Patel, currently in Africa with International Trade Secretary Liam Fox, was given a reprimand on Monday over the meetings in Israel.
But before the last two meetings were revealed, Downing Street had backed Ms Patel, saying that Mrs May still had confidence in her.
Labour’s shadow Cabinet Office minister Jon Trickett said there were strong grounds to believe Ms Patel had broken the ministerial code requirements for openness, collective responsibility, honesty and performing duties allocated only by the PM.
The situation is the latest in a growing list of problems for Mrs May.
Foreign Secretary Boris Johnson is facing calls to stand down after saying that Nazanin Zaghari-Ratcliffe was teaching people journalism while in Iran.
Charity worker Mrs Zaghari-Ratcliffe has been jailed in Iran since April last year and Mr Johnson’s remark could add years to her sentence.
Her husband and her employers insist Mrs Zaghari-Ratcliffe was in Iran on holiday with her young daughter.
Last week, Defence Secretary Sir Michael Fallon resigned after allegations of inappropriate behaviour and First Secretary of State Damian Green has denied claims by a former police chief that pornographic material was found on one of his parliamentary computers.
(c) Sky News 2017: Priti Patel had two more unauthorised meetings with Israelis