Why would he believe "reaching across the aisle" could possibly work, when no Republican congressmembers or senators have compromised with any Democratic president on anything since the Johnson Administration? The GOP now operates on the principle that the Democratic Party has no right to exist and that no victory it wins can ever be considered legitimate. Nobody in the GOP is interested in compromise anymore- and it's worth remembering that, despite all the endorsements from GOP political figures, Biden did no better among Republican voters than any other Dem in recent memory.