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ROTTERDAM, 8 April 2026 – Rotterdam city council has appointed Diederik Samsom as informateur to guide the next phase of coalition talks after the municipal elections. His appointment follows the advice of scout Cathelijne Bouwkamp and gives the city a new lead figure in the effort to form a broadly supported city government.
Samsom has been tasked with taking forward the route set out in Bouwkamp’s advice, which pointed to talks between GroenLinks-PvdA, D66, VVD and DENK as the basis for the next stage of coalition formation. In Dutch local politics, the informateur is the person who moves the process from exploration into more serious negotiation.
That means Rotterdam is now entering the phase where possible governing partners are expected to test whether political compatibility can actually be turned into agreements. The focus is no longer just on who might work together, but on whether they can build something stable enough to run the city.
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What Samsom has been asked to do
According to the council’s mandate, Samsom will guide negotiations between the four parties towards a coalition agreement. He will also look at how cooperation with other parties in the council, as well as with the city more broadly, could be organised.
In addition, he is expected to keep the council informed about the approach to the information phase, the progress of the talks and the eventual conclusion of the process. So his role is both political and procedural: helping the parties negotiate, while also making sure the wider council is kept in the loop.
Samsom points to broad support
Samsom said: “I’m looking forward to it. Rotterdam is a fascinating city with enormous potential and also a few very big challenges. I will get to work quickly to explore where parties can find each other. My ambition is to come back with something that has broad support.”
That last point matters. Coalition arithmetic can get a government over the line, but Rotterdam is clearly signalling that it wants something with wider legitimacy than a bare minimum agreement stitched together behind closed doors.
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A familiar name in Dutch politics
Samsom brings a long political and negotiating track record into the role. He previously served as leader of the Labour Party and as a member of the Dutch House of Representatives, and between 2019 and 2023 he was chief of staff to Frans Timmermans at the European Commission.
During that period, he played a role in the development of the European Green Deal as well as European recovery and energy policy. Earlier, he also chaired the negotiating table for the Dutch Climate Agreement, a role that depended heavily on bringing different interests together and getting them to settle on concrete deals.
Rotterdam moves into the next phase
At present, Samsom also holds several supervisory and advisory roles, including chair of the supervisory board of Gasunie and membership of the supervisory board of Naturalis Biodiversity Center. That wider background helps explain why the council sees him as someone equipped to handle a politically complex process.
The talks under his leadership are due to begin shortly. For Rotterdam, the goal is now clear enough: turn an exploratory coalition option into a stable and supported city government, and keep the council updated as that effort unfolds.
