A video widely circulated on Friday shows Israel’s far-right national security minister admonishing a Palestinian leader face-to-face inside a prison, saying Israel will confront anyone who acts against the country and “wipe them out.

Israel’s far-right security minister posted video footage of himself taunting the most high-profile Palestinian prisoner while visiting him in jail this week, in an encounter that has prompted outrage from supporters.

Marwan Barghouti is serving five life sentences after being convicted of involvement in attacks at the height of the Palestinian uprising, or intifada, in the early 2000s. Polls consistently show he is the most popular Palestinian leader.