Caroline Lucas has called upon ten other women MPs to form a female-led "emergency cabinet" to prevent a no deal Brexit with her.
The Green Party MP is calling on leading women politicians to come together to prevent a "crash-out Brexit".
Ms Lucas has written to the other female politicians opposed to a no deal and said the aim would be to secure a Commons vote of no-confidence in Boris Johnson, followed by the formation of a government of national unity.
Among the women she his invited to join her are Labour's shadow foreign secretary Emily Thornberry, Liberal Democrat leader Jo Swinson and Scotland's First Minister Nicola Sturgeon.
Writing in The Guardian, Ms Lucas said: "We need an 'emergency cabinet' - not to fight a Brexit war but to work for reconciliation. And I believe this should be a cabinet of women.
"Why women? Because I believe women have shown they can bring a different perspective to crises, are able to reach out to those they disagree with and cooperate to find solutions.
"A government of national unity must do exactly that - unite parties. And I believe that a cross-party cabinet of women has the potential to do exactly that."
The other MPs contacted are Ms Lucas are Tory former cabinet minister Justine Greening, senior Labour backbencher Yvette Cooper, the SNP's Kirsty Blackman, Liz Saville Roberts of Plaid Cymru, Change UK's Anna Soubry and the independents Heidi Allen and Lady Sylvia Hermon.
