Yes he can:

“But what the hell do they know about management and dealing with people? Nothing. If you look at my company, why, after all the success that we had before I ran for office would you not think that I couldn’t run the government? What the hell do I gotta do to prove myself? Or, after the success my company has had and our administration has had, why do you think I wouldn’t be qualified to be president of the United States? I mean, for God’s sake, I’m not running, but this is not different.”