In 1998 he became chair of the SP branch in Delfshaven, a poor district of Rotterdam, at the same time working to build up the party's European contacts.
In the European elections of 10 June 2004, the SP's electoral support grew from 5% to 7%, giving the party a second seat.
His comments in the Skopje daily Utrinski Vesnik on 14 January 2008 drew the ire of readers in the Republic of Macedonia.
He said that the country should tear down statues of the ancient Macedonian conqueror Alexander the Great erected on its territory and agree to a name change in its bilateral dispute with Greece.
[citation needed] On 8 July 2014 he was made member of the Dutch Senate, replacing Arjan Vliegenthart.