Prime Minister Anthony Albanese has stopped short of saying he supported Victoria Premier Jacinta Allan's new "adult time for violent crime" law reforms, which could see children as young as 14 jailed for life.

The federal and state leaders fronted a press conference together today to announce the opening of Melbourne's highly anticipated West Gate Freeway Tunnel, just days after Allan's controversial announcement earlier this week.

Her government said it will introduce new legislation to crack down on youth offenders committing serious offences — like machete crime, home invasion, carjacking and armed robbery — to be tried in an adult court and face greater penalties.

Albanese was questioned on what he thought about the proposed measures on his first visit to the state since they were

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