"I think the biggest question is who the heck is going to run against him among Republicans because everyone thought Zinke was going to run," said David C.W. Parker, a political science professor at Montana State University.
"I'm not saying that Issa is essentially going out there finding something willy-nilly," Mr. Parker said. "It's exploiting a problem, and seeing whether this works. When Waxman becomes chair, you see a lot of investigations under Bush."