Prime Minister Ahmet Davutoğlu on Monday harshly criticized the Peoples' Democratic Party (HDP) for failing to act in line with the constitution and instead take sides with the PKK terrorist organization amid ongoing attacks against civilians, hospitals, mosques, schools and other places in Turkey's southeastern provinces. Speaking to reporters at the airport before leaving for an official visit to Serbia, Davutoğlu underscored that he is open to discuss constitutional reforms with 'everyone,' but would never discuss the unity of the state. "This is a matter of intentions," Davutoğlu said, adding that politics is all about genuineness and courtesy. He slammed statements made by HDP deputies implying that they 'would call the government to account for the conflict in southeastern provinces' and asked them to bring the terrorists, who turned those regions into war zones into account. "They should keep silent if they can't," he added.He also said that Turkey is surrounded by crises and that he would never put the lives of Turkish soldiers on the negotiation table with the HDP. He noted that the HDP will receive treatment in accordance with its actions. "If it is a political party, then it should act like one. If it is a pawn of the terrorist organization [PKK], then it will receive treatment accordingly," he said, while adding that the HDP should sit on the table with 'whomever they are talking on behalf of.'The Prime Minister underlined that the government is closed to holding meetings with the HDP until they prove that they are a serious and genuine political party rather than an extension of the PKK terrorist organization. On Saturday, Davutoğlu had cancelled his offer to meet with Selahattin Demirtaş, co-chairman of the HDP, saying in a written statement that there is no point left to share a table with HDP. The reason for cancelling the offer was cited as the recent announcements coming from HDP officials targeting the government away from at least political kindness and aiming political polarization amid the ongoing clashes with the PKK terror organization.Davutoğlu also underscored the need to amend the constitution and a presidential system. "We must make a new liberal constution" he said, and added that the government believes the best form of administration is based on a presidential system. "Let us come up with such a constutitonal and administrational model that our grandchildren live in peace" the prime minister said.A constitutional amendment or a new charter is needed to set up a presidential system in Turkey. The country's current constitution was drafted two years after a military takeover in 1980 and numerous amendments have been made to it since then.According to the current Constitution, such an amendment requires the approval of two-thirds of Parliament, the votes of 367 out of 550 lawmakers. Only then can the president approve it or hold a referendum on the matter.The governmental system has been a hotly debated issue throughout modern Turkey's history beginning with the eighth president, Turgut Özal, and continuing with the ninth president, Süleyman Demirel. It has been brought up again by Erdoğan, who has claimed that a presidential system is more suitable to the country's political structure.