This is the result of Saturday's party leadership meetings at Amalienborg Palace, where King Frederik X was to appoint a new exploratory leader to find a solution.
"It's been two months since the general election in Denmark. Now I think a government should be formed," says Frederiksen.
Liberal Left party leader Troels Lund Poulsen gave up his plans to form a government on Friday after the Moderates' Lars Løkke Rasmussen did not support his proposal.
Frederiksen will try to form a center-left government, consisting of the Social Democrats, the Socialists, the Radical Left and the Moderates, she says.
She expects to resume negotiations on Sunday.
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