Mateusz Morawiecki sent out the invitations on Wednesday, Polish state news agency PAP reported.
The prime minister-designate contacted the Left grouping, the left-wing Razem group, the centre-right Third Way alliance, and the far-right Confederation party, according to news outlets.
Opposition MP Krzysztof Gawkowski shared Morawiecki's letter on the X social media platform, adding that the Left party would not accept the invitation.
In the letter, the prime minister-designate wrote that the talks would be designed to "build a coalition" to deliver policy pledges made to Polish people during the election campaign, regarding "economic issues as well as social issues, such as family policy, education and health."
Morawiecki proposed to hold the discussions on Thursday or Friday, the PAP news agency reported.
Sławomir Mentzen, one of the leaders of the Confederation, said he had also received an invitation from the prime minister-designate, adding that Morawiecki "has no credibility" and refusing to attend the talks.
Razem's Adrian Zandberg said his party "is not interested in being part of Mateusz Morawiecki's Cabinet," as the current conservative government had toughened abortion rules and rejected "tens of bills" on social issues, housing and taxes, the PAP news agency reported.
Zandberg noted that, following last month's election, the ruling conservative Law and Justice (PiS) party "doesn't have a majority in the lower house."
Mirosław Suchoń, a senior lawmaker with the Third Way, confirmed the alliance had received a letter from Morawiecki.
He said that the Third Way, which consists of the centre-right Poland 2050 group and the rural-based Polish People's Party (PSL), "won't be attending the meeting" with Morawiecki as it is "in the process of forming a government" with fellow pro-European Union opposition parties.
The PSL's leader Władysław Kosiniak-Kamysz told reporters that a meeting with Morawiecki would "make no sense."
Donald Tusk, the leader of the largest opposition bloc, the Civic Coalition (KO), said that if he received an invitation for talks from Morawiecki, he would decline it, as such a meeting would be "a waste of time," the PAP news agency reported.
Earlier this week, Morawiecki appealed to the country's opposition parties to back his new Cabinet, saying it could deliver their proposals in areas such as social policy, healthcare and education.
He mentioned seniority pensions, new services for seniors, boosting education spending to 6 percent of GDP and science spending to 2 percent of GDP, among other plans.
Poland to appoint new gov't
Poles elected a new set of 460 MPs and 100 senators when they went to the ballot box last month.
Polish President Andrzej Duda this month named Morawiecki, who has led Poland's government since 2017, as prime minister-designate, tasking him with forming a new Cabinet.
The ruling conservative Law and Justice party won Poland's October 15 election, but lost its parliamentary majority and looks unlikely to stay in power for a third consecutive term.
Meanwhile, Tusk has already chosen most candidates for ministerial roles in his future Cabinet, according to the Rzeczpospolita newspaper.
A bloc of opposition parties led by Tusk's Civic Coalition last week secured a resounding victory in Poland's new parliament during its first key vote to elect a house Speaker.
On November 10, these opposition groups, which also include the PSL, Poland 2050 and the Left, signed an agreement to form a coalition government, pledging to restore the rule of law, promote green energy and relax abortion rules, among other policies.
Tusk was Poland's prime minister from 2007 to 2014.
(pm/gs)
Source: PAP, Polsat News