Salvini's League is increasingly luring voters directly from its coalition partner; Di Maio's 5Stars | Alberto Pizzoli/AFP via Getty Images Italy’s League grows in popularity as 5Star support falls Matteo Salvini’s party goes up, while Luigi Di Maio’s goes down.

An opinion poll published Saturday shows a widening gulf in support between the far-right League and its coalition partner the 5Star Movement.

Corriere della Sera, a daily, published an Ipsos poll showing that the League, which is headed by firebrand Deputy Prime Minister Matteo Salvini, is edging away from its coalition partner. In the poll, 34.7 percent of Italians said they would vote for the League — a huge rise from the 17.4 percent who actually voted for the party in March's general election.

However, 28.7 percent said they would vote for the 5Stars, down from the 32.7 percent that voted for the party in March.

The news comes at a time of significant tension between Rome and Brussels over the Italian national budget, as well as growing divisions within the government.

5Star leader Luigi Di Maio, who is also a deputy prime minister, addressed those tensions in an interview with Corriere della Sera on Saturday. "We signed a government contract that needs to be respected by both sides," he said, referring to policies promised by his party that are now encountering resistance from the League.

The poll also shows that the League is increasingly luring voters directly from its coalition partner: 16 percent of those who said they would now back the far-right party had voted for the 5Stars.

There's good news for the government in the poll: 57 percent of Italians now approve of the government, a higher level of support that the previous six Italian governments had enjoyed at a similar period of their mandate.