A group of about 30 people, carrying Turkish flags and photographs of President Recep Tayyip Erdogan, called on Turkey to intervene directly in an offensive to retake the city.
Iraq's Supreme Court on Monday ruled against a decision by Prime Minister Haider al-Abadi to scrap three vice-president positions, weakening his political standing by overruling one of his most important measures to streamline the government.
The Turkish leader said Abadi himself had asked for the formation of a military base in Bashiqa, located some 12 kilometers (7.5 miles) northeast of the Daesh-held city of Mosul. He added that Turkey have evidence and testimony, which they will publish in the coming hours.
Erdogan suggested Turkey could take a similar attitude in Iraq, where expectations are growing of an assault to drive Islamic State out of the northern city of Mosul.
Earlier, Turkish deputy prime minister Numan Kurtulmu said that the Kurdish Regional Government in northern Iraq had requested Turkey's mililtary help in fighting terrorist elements there. "You should know that we will do what we want to do".
For weeks, anti-terror forces have been preparing for a large offensive in Mosul to clear out the Islamic State's fighters there.
"If you try to change the demographic structure in Mosul, you will ignite the fire for a major sectarian war", Turkish Prime Minister Binali Yildirim told members of his ruling AK Party at a meeting in parliament.
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North Atlantic Treaty Organisation member Turkey shares a 1,200 km (750-mile) border with Syria and Iraq and faces threats from Islamic State militants in both.
He added Turkey could not be "a mere spectator" over the developments in Iraq.
"The Turkish military will enter Mosul".
The Turkish army said 31 Isil militants were killed on the road to Dabiq in clashes with rebels and US-led coalition airstrikes on Sunday. Majority of the Turkish troops are camped in Bashiqa where they're training Iraqi and Kurdish Sunni fighters.
The Turkish parliament voted lately to extend its military mandate in Iraq and Syria, in a move that has further angered Iraqi officials.
Iraqi forces are now preparing for the operation to seize the city from IS, which overran it and other areas in 2014 but has since lost significant ground in the country.