In the European Parliament, he was the leader of the Alliance of Liberals and Democrats for Europe (ALDE) from 2009 to 2019. In 2010, he co-founded the inter-parliamentarian Spinelli Group to support the creation of a European Federation. He was the ALDE Party nominee for President of the European Commission in the 2014 European Parliament election. He served as the European Parliament's Brexit Coordinator and Chair of the Brexit Steering Group from 2016 to 2020.
In the ,European Parliament he was the leader of the Alliance of Liberals and Democrats for Europe (ALDE) from 2009 to 2019. In 2010, he co-founded the inter-parliamentarian Spinelli Group to support the creation of a European Federation He was the ALDE Party nominee for President of the European Commission in the 2014 European Parliament election. He served as the European Parliament's Brexit Coordinator and Chair of the Brexit Steering Group from 2016 to 2020.