New Jersey Rep. Jeff Van Drew Jeff Van DrewThe Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida The Hill's 12:30 Report: First Kennedy to lose a Massachusetts election Ex-Democrat Van Drew speaks at GOP convention MORE’s former campaign manager said Monday he is working for one of his former boss’s Democratic challengers after leaving Van Drew’s office when the congressman switched parties.

Joshua Roesch tweeted that he signed on to work for Amy Kennedy’s campaign for New Jersey’s 2nd District.

Roesch praised Kennedy as “a public school teacher, mental health advocate, and a mom of 5 that will never stop fighting for [South Jersey.]”

.@CongressmanJVD turned his back on South Jersey families.



This week I signed on to work for @AmyKennedy715, a public school teacher, mental health advocate, and mom of 5 that will never stop fighting for SJ. #NJ02



Help us out: https://t.co/hLCZnaV6wGhttps://t.co/vPTRikbAKx — Joshua Roesch (@joshuadro) January 13, 2020

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Roesch told NJ Advance Media it's a “strange” and “unique” situation working for the campaign against his former boss, but stood by his decision to leave Van Drew’s office.

“I thought I was working for a Democrat,” Roesch said. “I’d like to go work for a Democrat still.”

Van Drew lost a handful of his top staffers after signaling he would be switching parties over his opposition to impeaching President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE.

He officially announced he will become a Republican in December, in an Oval Office meeting.

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Kennedy announced her run for the seat earlier this month. She is one of at least five Democrats running for the seat, including Montclair State University political science professor Brigid Harrison, former Sen. Cory Booker Cory Anthony BookerDHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility Black Voters Matter Fund deploying voter outreach caravans in 12 states to drive turnout MORE (D-N.J.) aide Will Cunningham, Atlantic County Freeholder Ashley Bennett and West Cape May Commissioner John Francis III.

He also faces a handful of GOP challengers.

Van Drew’s new campaign manager is Ron Filan, a former New Jersey state director for the Republican National Committee and political director for the GOP state committee, according to NJ Advance. Bill Stepien, a former Trump White House political director who helped former New Jersey Gov. Chris Christie (R) win two gubernatorial terms is also aiding Van Drew's Republican campaign, the outlet reports.

The district had been held by a Republican before Van Drew’s election as a Democrat in 2018.