Acting Prime Minister Winston Peters has denied blocking Opposition MPs considering the so-called waka-jumping bill from having a say.
National's electoral law spokesman Nick Smith said the justice select committee looking at the Electoral (Integrity) Amendment Bill was unable to consider any amendments nor get any advice from officials on key issues.
"Government MPs simply stated the bill had to be reported back to the House unamended to meet the demands of Winston Peters," Smith said.
"Not a single submission supported the bill without amendment yet the Government insisted it be progressed as is. The Ministry of Justice would not provide any views on the bill and simply stated it was government policy to pass it unamended," he said in a statement.
"The offensive part of this bill is enabling a party leader to dismiss an MP, a provision demanded by Mr Peters to enable him to wield even more power. It's particularly outrageous that this bill is proposing to be passed when a majority of Parliament oppose it."