Wilders, who has courted controversy with his hardline anti-Islam, anti-immigrant stance and his incendiary insults against Moroccans and Turks, has long been under 24-hour police protection.
But tensions are escalating ahead of the March 15 election in which the MP's Freedom Party is running neck-and-neck with the Liberals of Prime Minister Mark Rutte.
On Saturday, Wilders upped the tone at the launch of his official campaign, denouncing "a lot of Moroccan scum who make the streets unsafe".
National police spokesman Dennis Janus confirmed to AFP that an agent had been arrested on Monday suspected of "violating official secrets".
"The police together with the public prosecution service are currently investigating," Janus said, but declined to give further information.
Citing high-level police sources, the NRC daily reported that an agent had handed over information about Wilders' movements to a Moroccan-Dutch criminal organisation.
The leak was serious enough to trigger talks between Wilders and his political foe Rutte, who also refused to comment to reporters afterwards.
It was not immediately clear whether the agent was directly involved in Wilders' personal protection.
But Wilders, who was last year convicted by a Dutch court of discrimination, said in a tweet: "If I cannot blindly trust the (team) that has to protect me I can't function. It's unacceptable!"
Dutch police chief Erik Akkerboom told news radio station BNR: "What we know up to now, is that (Wilders') safety was not in question.
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
