Jim Risch of Idaho is a couple of years ahead of Rubio in seniority.
Risch chairs Foreign Relations. Only one ‘major’ committee chair at a time is allowed. Burr stepping aside seems to be temporary. Risch can choose, but Rubio is most likely.
Don’t know anything about Risch, and he might be good. Rubio would be good too... he’s a smart man who is with the program although he comes from a relatively liberal area. Even though he’s a senator, he has to satisfy the liberal part of his constituency who elect him form South Florida and perhaps be less forthright. So I think some of his statements aren’t as strong as they used to be when he was running.
Also, I don’t know what the thing is with Trump. He was very insulting to Rubio, but basically Rubio has supported Trump and his programs here in Florida, and if Trump reached out to him, this could be a really good thing all around.