On Monday, Humza Yousaf, who had been in the spotlight for little over a year, announced his resignation.
He plans to hold the two positions until a replacement is identified.
John Swinney, a former deputy first minister, is the first to declare his intention to run.
Former finance secretary Kate Forbes was expected to endorse him, but she has already declared she will back Mr. Swinney instead of standing.
John Swinney is who?
Born in Edinburgh Following Nicola Sturgeon’s resignation in 2023 as deputy first minister, Mr. Swinney was placed on the backbenches and remained there for a year.