The ruling party has undertaken some controversial policies, but denied it is a threat to democracy.
Protesters have taken to the streets after the announcement of planned restrictions on press access to parliament.
The country is looking to increase pensions and lower retirement age.
Polish police have offered assistance in investigating the killing of a Polish factory worker.
"We want to protect Polish citizens from that," a government spokesman said.
Antoni Macierewicz says 150,000 soldiers is the minimum needed "to respond to military threats."
The government's popularity has fallen over changes to the constitutional court.