"Wilders understands that culture and demographics are our destiny," Mr King wrote on Twitter.
"We can't restore our civilisation with somebody else's babies," he added.
The US Republican Representative of Iowa is a strong advocate of putting a stop to birthright citizenship.
All children born in the US currently get citizenship under the constitution, including the children of families living in America illegally.
Mr King has pushed for radical reform of the interpretation of the 14th amendment of the US constitution so that it no longer gives the children of undocumented migrants the right to a US passport.