In her letter to committee members, Esty says she learned through a third party in 2016 about possible misconduct involving her then-chief of staff. Esty has said she fired him three months later, after an internal investigation revealed widespread harassment allegations from staff. By early July Kain obtained a protective order from Washington, D.C., police.
The move by Esty to not seek reelection comes after various CT politicians called on her to resign.
"The leader was informed of the congresswoman's decision before the announcement", the aide said.
He also accompanied the congresswoman to the 2016 Democratic National Convention in Philadelphia before leaving with a positive reference from Esty. Baker, through friend and spokesman Andrew Ricci, denied he punched Kain but did not challenge her other allegations. Mr. Baker, who has since received treatment for alcoholism and anger management, apologized to Ms. Kain and the congresswoman, Mr. Ricci said.
A lawyer for the committee said he could not comment on Esty's request for an investigation.
Pelosi has called for the resignation of Democrats accused of misconduct in the past, most notably Nevada Representative Ruben Kihuen and former Michigan Representative John Conyers.
Esty has represented the district since 2013. Sweet contacted staffers, including Kain, in July.
Esty had staved off calls to resign for days following the report.
Ms. Esty, an attorney, said she was alerted in May 2016 of possible misconduct by Mr. Baker, and that a subsequent inquiry found "a pattern of behavior that victimized numerous women on my staff". But for Republicans, the sudden drama could create a rare, if still long-shot, opportunity to offset this year's likely House losses with an even rarer blue-state pickup.
Baker stayed in his position until August of that year, however. "To know that I sat next to this man for so many months".
Rather than firing or suspending Baker, the congresswoman consulted her personal attorneys and advisers, she said. "We could have been the face of it".
"Although we worked with the House Employment Counsel to investigate and ultimately dismiss this employee for his outrageous behavior with a former staffer, I believe it is important for the House Ethics Committee to conduct its own inquiry into this matter", Esty said Monday in a statement. Esty kept Baker on her payroll for three months after learning of the accusations against him, CNN has confirmed.
"There was no independence", said one former staffer, who was interviewed by Sweet in mid-July. In the awful situation in my office, I could have and should have done better. A phone number listed for a Tony Baker in Columbus, Ohio, where the spokesman said the former chief of staff was living, was disconnected.
"She had said that he was going to OH to work for Hillary Clinton", one former staffer said.
As part of a severance agreement, Baker received about $5,000 in taxpayer money when he was sacked.