The Scottish Conservatives will give Nicola Sturgeon a last chance to resign for misleading the Scottish Parliament on Tuesday.
Should the First Minister refuse, the party will proceed with a Vote of No Confidence on Wednesday.
The specific timing will be subject to the agreement of the cross-party parliamentary bureau.
Scottish Conservative Holyrood leader Ruth Davidson said: “If Nicola Sturgeon has a shred of integrity, she should be considering her position. She has every opportunity to do the right thing and resign.
“No First Minister is above the fundamental principles of honesty and trust. There is no question that Nicola Sturgeon has misled Parliament and broken the promises she made to tell the truth.
“The SNP’s erratic outburst today against the committee shows the panicked spiral they are now in.
“Their suggestion seems to be that Andy Wightman, arguably the MSP most likely to rigidly stick to his principles, is some kind of underhand political opportunist. It is an extraordinary attack on a committee, and its members, before it has even reported.
“If it was possible, the SNP’s defence looks even less credible now. They are lurching from whataboutery to unhinged criticism of a well-respected, independent-minded parliamentarian.”