Turkish President Recep Tayyip Erdogan has described the Dutch as "Nazi remnants and fascists", as a diplomatic row grows over a cancelled rally.
The Turkish foreign minister was due to speak in the Dutch city of Rotterdam on Saturday in support of a referendum to give Mr Erdogan greater powers.
But the rally was banned for security reasons, and the minister's plane was then refused permission to land.
Dutch Prime Minister Mark Rutte said the remark was "way out of line".
"It's a crazy remark, of course," Mr Rutte said.
Turkey has summoned the Dutch charge d'affaires to the foreign ministry in Ankara for an explanation.
In a strange twist, Turkey's family minister will attempt to travel by land to the Dutch city of Rotterdam, Turkey's state-run Anadolu news agency said.
Fatma Betul Sayan Kaya is in Germany for separate meetings but plans to head to the Netherlands later, despite having her meetings there cancelled.
'Reasonable solution impossible'
President Erdogan reacted to the ban on his foreign minister by threatening to block Dutch flights.
He said: "Ban our foreign minister from flying however much you like, but from now on, let's see how your flights will land in Turkey."
Foreign Minister Mevlut Cavusoglu also warned Turkey would impose heavy sanctions if his visit were blocked.