Democratic Rep. Eric Swalwell announced Sunday that he is suspending his campaign for governor following mounting pressure from allies and staff over multiple allegations of sexual misconduct.

“I am suspending my campaign for Governor,” Swalwell wrote on social media. “I deeply regret past mistakes in judgment. I will fight the serious allegations against me, but that is a personal matter, not one for a political campaign.”

The decision comes after a wave of criticism from both Democrats and Republicans following allegations published in the San Francisco Chronicle. A former staffer accused Swalwell of engaging in a sexual relationship with her while she worked in his office and alleged that he sexually assaulted her on two occasions while she was intoxicated. While her identity and employment were confirmed, the claims have not been independently verified.

The Chronicle reported it reviewed text messages the woman sent to a friend shortly after one of the alleged incidents, as well as medical records indicating she sought pregnancy and sexually transmitted disease testing. The publication also spoke with individuals who said she had disclosed the allegations at the time.

Swalwell has denied the accusations, calling them “false” and stating in a video message that the alleged assaults “did not happen.”

Additional reports by CNN cited allegations from four other women, including claims of inappropriate behavior. Those reports also cited interviews and message exchanges, though they have not been independently corroborated.

The controversy prompted swift backlash within his own party. California Reps. Jimmy Gomez and Adam Gray—who served as co-chairs of his campaign—were among those calling for him to withdraw.

Former House Speaker Nancy Pelosi said the allegations must be taken seriously and should be addressed outside the context of a political campaign. Sen. Ruben Gallego also withdrew his endorsement, citing the seriousness of the claims.

In a separate development, the Manhattan District Attorney’s office confirmed it has opened an investigation into the allegations.

Additionally, a group of 55 former staffers released a public letter urging Swalwell to withdraw not only from the race but also from Congress, calling for a full investigation and expressing support for the accuser.

The primary election for California governor is scheduled for June 2, with early voting set to begin May 4.