Trump didn’t say they were spying “on” his campaign, but that they were spying “in” his campaign. And yes, Clapper confirmed that they were spying in his campaign, even if they were spying on Russia.
Remember, Comey told Trump they weren't going to investigate the dossier cuz it would look like they were investigating Trump.
Which makes absolutely no sense at all.
Comey told the president 3 times...that he was not the target.
Well, obviously he was.