Populist MP Geert Wilders is threatening to reveal ‘shocking and unacceptable’ information which he has gleaned from a top security government commission, Dutch media report.

Wilders is planning to introduce a parliamentary motion based on what he has been told in the parliamentary commission for security and the security services, which is open to all party leaders.

The discussions within the committee are considered to be so confidential that they have to remain secret, even from party members.

Wilders has said the ‘shocking and unacceptable facts’ cannot be ignored. He says they should either be shared with all MPs in a closed session or that he will bring in a motion in which he says nothing about the contents but that ministers will understand what he is referring to.

However, security service sources have told broadcaster Nos they have no idea what Wilders is referring to and there is ‘no shocking new’ information about the terrorist threat in the Netherlands.