According to Dutch News:
At least two MPs from the Socialist Party have said they will not swear allegiance to King Willem-Alexander at his investiture in April because they are republicans.
Willem-Alexander will be inaugurated as king in front of all the members of the upper and lower houses of parliament. During the ceremony, all 225 parliamentarians take it turns to say: ‘I swear to maintain your inviolability and the rights of your kingship.’
To read the entire article on Dutch News, please click here.

Prince Willem-Alexander is the host on Veterans Day. He is the eldest son of Queen Beatrix of the Netherlands and her late husband, Prince Claus of the Netherlands, Jonkheer van Amsberg. Photo credit: Willem Alexander (1967)
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Also of interest:
Queen Beatrix to abdicate Dutch throne – National Post
Pro Europa Christiana Federation interview with Duke Paul of Oldenburg
Foreword by Prince Luiz de Orleans e Bragança