There was no interim president in 2020. The Constitutional Court ruled that since the constitution provide for one to organise new presidential election, and that there already was a president elect from the recent one, there was no need for an interim by the president of the national assembly, Pascal Nyabenda. The court instead ordered for the intronisation of president elect Pierre Nkurunziza to take place as soon as possible, leading to it happening on 18 June instead of 20 August. Source in french : [1] and [2].--Aréat (talk) 16:32, 20 June 2020 (UTC)Reply
Article 121 of the constitution state that an interim by the National assembly's president start once the Constitutional court constate the vacancy of the presidence. The court did so on 12 June, but in the same ruling named the president elect as president instead, as stated above.--Aréat (talk) 01:07, 23 June 2020 (UTC)Reply