The search for Italy's next prime minister was thrown into disarray after doubts were cast over the suitability for the post of law professor Giuseppe Conte, the candidate chosen by populist allies.
Conte is no longer certain of endorsement by Luigi Di Maio of the anti-establishment Five Star Movement and Matteo Salvini of the anti-immigrant League, according to a Five Star official who declined to be named.
Di Maio himself may be back in the running for the premiership, the official said.
La Repubblica earlier reported doubts on Conte.
A League official, however, said the reported questioning of Conte's candidacy was not completely accurate, without elaborating.