Speaker can't be interim president. With no vote confirmed she is also out of a job.
Grassley, kek
Line of succession has it going to the president pro tempore of the senate(Grassley)
Line of succession-
1 President
2 Vice President
3 Speaker of the House
4 President pro tempore of the senate
1,2 and 3 are all in the same boat, unemployed without a vote.
leaving Grassley with the nod.