ROME (Reuters) - Italy’s populist government on Monday escalated its clampdown on irregular immigration with a decree aimed at slashing the number of people awarded asylum and doubling the time irregular migrants can be detained.

The legislation promoted by Interior Minister Matteo Salvini, who leads the far-right League party, comes as boat arrivals plummet and the minister refuses to allow charity ships carrying rescued migrants to dock in Italy’s ports.

“This is a step toward making Italy safer,” Salvini tweeted.

The League, which took power in June in coalition with the 5-Star Movement, has promised to deport hundreds of thousands of irregular migrants. Already, the move to refuse to let rescue boats dock has proven popular, doubling opinion poll support for the League since the election in March to more than 30 percent.

The Salvini Decree aims to limit the use of a form of international protection that has been widely used in recent years but is not strictly tied to political persecution or war.

“Humanitarian” asylum was given to more than 20,000 people last year, or 25 percent of those who sought asylum, against the 16 percent of asylum seekers awarded one of the other two forms of international protection.

It is given to migrants who are deemed to have “serious reasons” to flee their home country - a category that has often included homosexuals fleeing harsh anti-gay laws in Africa.

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The decree limits humanitarian protection to victims of domestic violence, trafficking, work exploitation and natural disasters, to those needing urgent medical care, and to people who carry out “particularly valuable civic acts”, Salvini said.

“Humanitarian protection was supposed to be used sparingly,” Prime Minister Giuseppe Conte told reporters. “In Italy, there has been an indiscriminate reception (of migrants) and the rules helped support this.”

MIGRATION PACKAGED WITH SECURITY

Other immigration measures include extending to 180 days from 90 the time an irregular migrant can be detained before being freed, to give the state more time to complete the deportation procedure.

The decree would also widen the range of criminal offences that trigger the stripping of asylum privileges applied for or already granted.

Such a move could fall foul of the 1951 U.N. Refugee Convention, which is intended to protect all refugees, whether formally recognized or not, from being forcibly returned, except where they are a danger to public safety or national security.

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Before the government approved the draft decree, a source in President Sergio Mattarella’s office had said parts of it might be unconstitutional - which could open the way for Mattarella to block it

The new immigration guidelines were packaged together with new security rules in an emergency decree, which has 60 days to secure parliamentary approval. Salvini said parliament was likely to make changes.

The security measures include heightened controls on those who rent trucks, in response to a series of attacks in Europe aimed at causing mass casualties. It also foresees stripping naturalized foreigners who are convicted on terrorism charges of their Italian citizenship.

The head of the Italian Catholic bishops’ conference, Nunzio Galantino, on Sunday criticized the decision to link immigration and security in the same piece of legislation, saying:

“We cannot consider the immigrant’s condition to be automatically that of a criminal.”