This follows a review by former justice minister Lord Wolfson of Tredegar, whose draft conclusions recommend leaving the ECHR.
Lord Wolfson's report argues the ECHR has gone “well beyond” its original intent, imposing unpredictable “constraints” on government and domestic courts, particularly regarding immigration.
The announcement, anticipated at the Tory conference next week, aims to align the party with Nigel Farage's stance on the ECHR amid challenges with illegal migration.
While Lord Wolfson claims human rights would not be harmed, Labour's attorney general Lord Hermer warned that leaving would place the UK alongside Russia and Belarus.