NSW Nationals leader John Barilaro says media reports that a party official is being appointed to a minister's office despite being linked to the recruitment of alt-right members are a "witch hunt".

Nationals ministers and MPs have raised concerns over the appointment of Jeff McCormack as chief of staff to Water Minister Melinda Pavey.

John Barliaro says no Nationals MPs have raised concerns over Jeff McCormack's appointment with him. Credit:Alex Ellinghausen

Mr McCormack was one of two people named in parliament in 2018 by Labor MP Walt Secord who demanded to know whether the Nationals planned to expel him over a branch-stacking exercise that resulted in the alt-right infiltration of the youth wing of the party.

Screenshots of a Young Nationals Facebook page, seen by AAP, show Mr McCormack added to the group some of the people who were later booted from the party for their links to the alt-right.