National wants to grill the Police Commissioner about the Parliament occupation and riot but the Government says any review must be free of political interference.
The occupation ended on March 2, when rioting broke out and protesters and police were injured.
National's justice spokesman Paul Goldsmith said MPs should have the chance to question commissioner Andrew Coster about the 23-day occupation and its aftermath.
"The riots in front of Parliament and the occupation were a huge event and it shouldn't be swept under the carpet," Goldsmith said.