Quote from CaptainObvious:
No you cannot sue him and win, but he can sue you. If you implied in anyway that a job, any job was guaranteed, implied it even in the smallest sense, you're done. If you implied you can get him even an interview, he has a case. If he spent a nickel preparing for that interview, you're liable for that nickel if you lead him to believe it was a lock. Best you drop it while you're ahead.
BTW, many moons ago I worked for a short time recruiting attorneys, so I know of what I speak.
More: I hate attorneys.
I never implied to him that he would get an interview; I did not imply anything to him. All I did was submit his CV to my client after he told me he was interested in the position, the client then told me that they are not interested in him, and then I emailed my candidate to let him know that the client was not interested. He emails me back calling me an asshole. It was not my fault that my client was not interested in him. He is just a sore loser and bitter because he was really interested in the position, but my client was not interested in him.