Classified documents: how do the Trump and Biden cases differ?

The president and his predecessor have each retained secret papers but what do we know and what happens next?

The discovery of documents from the Biden-Obama administration in at least two locations linked to Joe Biden has been greeted with dismay by Democrats and glee by Republicans, given the extensive legal troubles that Donald Trump faces for taking classified papers to his Florida resort.

Republicans believe the incident shows that Biden has committed the same transgression as the former president, and argue that the FBI raid on Mar-a-Lago and subsequent investigation were politically motivated points-scoring.