Democratic presidential nominee Joe Biden is closing in on an announcement of a running mate as early as midweek, having completed interviewing all the top candidates, people familiar with the planning said Monday.

Biden is now deliberating about his choice, the people said. While Biden’s staff is preparing for an imminent rollout, they also know he has a tendency to delay important decisions until the last minute.

In 2008, Barack Obama did not announce his choice of Biden until the Saturday before the Democratic National Convention while in 2016, Hillary Clinton waited until the Friday before the convention to announce her pick. The convention begins next Monday.