Luigi Mangione in court as lawyers seek to rule out notebook, gun and other key evidence

A legal expert explains how the defence could stand to gain even if their longshot bid fails this week.

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Mr Mangione, 27, has pleaded not guilty to both state and federal murder charges, which carry the possibility of the death penalty.

The pre-trial hearing could last several days, as defence attorneys are expected to call a host of witnesses, including from Pennsylvania, where he was arrested at a McDonald's.

In September a judge threw out state terrorism-related murder charges against Mr Mangione, arguing prosecutors had failed to establish evidence to justify them.

Mr Mangione's legal team is now hoping to convince a judge to exclude evidence including a gun and a notebook in which prosecutors say he set out a motive.