Hamas has informed Fatah of its opposition to the Palestinian unity government, Hamas spokesman Sami Abu Zuhri said.
"Hamas's final position is that we don't agree to the formation of a government that does not include a Ministry for Prisoners Affairs," Abu Zuhri said.
The Hamas spokesman said his movement would consider Palestinian Authority President Mahmoud Abbas's announcement of the new government a "unilateral" step. Hamas, he added, will not recognize this announcement.
The announcement is expected to come on Monday at 1 p.m.
On Sunday, Prime Minister Binyamin Netanyahu called an emergency cabinet meeting a night ahead of the planned Palestinian Authority-Hamas formal unity government declaration.
During the cabinet meeting, the ministers agreed to completely halt negotiations with the Palestinian Authority as long as it remains united with terror organization Hamas and to lower the amount of money transferred to the PA.