When a California Democrat in Congress recently engaged in an extended conversation with Sen. Dianne Feinstein, they prepared for a rigorous policy discussion like those they’d had with her many times over the last 15 years.

Instead, the lawmaker said, they had to reintroduce themselves to Feinstein multiple times during an interaction that lasted several hours.

Rather than delve into policy, Feinstein, 88, repeated the same small-talk questions, like asking the lawmaker what mattered to voters in their district, they said, with no apparent recognition the two had already had a similar conversation.

The episode was so unnerving that the lawmaker — who spoke to The Chronicle on condition they not be identified because of the sensitivity of the topic — began raising concerns with colleagues to see if some kind of intervention to persuade Feinstein to retire was possible.