Who might replace Humza Yousaf as SNP leader?
So with Humza Yousaf falling on his sword, who's likely to take over?
An obvious name is Kate Forbes. She narrowly lost to Humza Yousaf in the SNP leadership contest which saw him become leader.
Her campaign was rocked by her admission that she wouldn't have backed same-sex marriage, but by the time the membership voted 48% of them still opted for the Highland MSP.
She has rebelled on a number of issues while she's been on the backbenches, and is widely seen as representing a more socially conservative wing of the party.
She has also expressed concern that the party's been losing focus on rural areas.
If she was to get the job, could she govern? The SNP doesn't have a majority, so how does legislation get passed in this scenario?
The Scottish Greens don't like Kate Forbes's stance on a number of social issues, so their backing won't be forthcoming.
The Green co-leader Patrick Harvie said this morning that it would be a "mistake" for the SNP if they were searching for a stable government.
But it's possible she could do deals elsewhere with other parties.
Minority government at Holyrood is nothing new. One ally of Kate Forbes told me that you could work with other parties on an issue-by-issue basis.
Another name doing the rounds is that of the former deputy first minister John Swinney.
He's widely seen as an experienced, popular, safe pair of hands in the party.
He didn't want the job last time round, but has said he will now give it "very careful consideration".
"It's likely I'll have more to say on that in the days to come," he said.
He also said he did not believe there should be a snap Scottish Parliament election, and that it should see out its fixed five-year term.
Stephen Flynn, the SNP's Westminster leader, is a big name in the party. And he's widely considered to be doing quite an effective job in they key public part of his role - taking on Rishi Sunak at prime minister's questions each week.
But this would come with complications - an MP at Westminster can lead the party, but the first minister has to be someone sitting in Holyrood.
My understanding is that Mr Flynn isn't interested in the job at this point.
Other names being reported include Education Secretary Jenny Gilruth and Health Secretary Neil Gray.
Whoever takes over will face at least one problem Humza Yousaf has had in recent weeks - how do you run a government without a stable majority?
Mr Yousaf found out the hard way how difficult that can be.
