Norman Lamb has warned his party that Brexit voters felt they were treating them like "idiots" as he warned the Lib Dems risked looking like a single-issue pressure group.
Mr Lamb said the party needed to "start thinking again", coming up with ideas to address the concerns of voters who often felt powerless in the face of bureaucracy and large corporations.
The North Norfolk MP was speaking ahead of the party's annual conference, which begins in Bournemouth today.
Mr Lamb said:
Mr Lamb, whose North Norfolk constituency voted to Leave the EU, criticised his party's tactic of putting opposition to Brexit at the heart of the election campaign under former leader Tim Farron.
"A lot of people felt that we were treating them as if they were idiots for having voted for Brexit," he said. "And yet, as liberals, we ought to understand people's anxieties about remote power."