Staff members at the anti-Trump group, the Lincoln Project, are stepping down from their posts following reports that the organization did not promptly respond to allegations of sexual misconduct on the part of one of its co-founders.

The political action committee, which was set up in late 2019 by several former Republican operatives, has seen at least four members of its ranks leave in recent days, including Steve Schmidt, a co-founder who worked on the campaigns of high-profile Republicans such as former President George W. Bush and the late Sen. John McCain.