Leana Wen, the recently fired former president of Planned Parenthood, appears headed toward an increasingly contentious exit, after accusing the organization’s leadership of trying to “buy my silence” in a dispute that threatens to prolong and magnify an acrimonious transition at the top of the nation’s best known women’s health care and reproductive rights group.

Dr. Wen has been engaged in two months of fraught negotiations over her severance package since she was fired in July. She led Planned Parenthood for less than a year and accused the organization of withholding her health insurance and departure payout as “ransom” to pressure her to sign a confidentiality agreement.

She made the accusations in a barbed 1,400-word letter to Planned Parenthood’s board of directors this past week, which was obtained by The New York Times. “No amount of money can ever buy my integrity and my commitment to the patients I serve,” Dr. Wen wrote.

The public airing of internal discord comes at an inopportune time for Planned Parenthood as both the organization itself and its abortion services have come under assault by the Trump administration and Republican-controlled statehouses.