The SNP has called on the Speaker to appoint them as the official opposition. Erskine May outlines the requirement that Her Majesty's Official Opposition be "prepared to assume power".
Based on the fact that Corbyn is incapable of putting together a front bench and has less supporters in the PLP than the SNP have MPs, and given the SNP have spokesmen shadowing all government departments, there is at least some support for their claim
This is how low Corbyn has brought the party. It's time for him to resign
Who do you think it is...