Supposedly...

Donald Trump sent "detectives" to Hawaii to uncover the truth about President's Obama's birth certificate.
Ironically, there seems to be some doubt about whether Trump really hired any private eyes at all....

I still maintain he ought to set those gumshoes on Mitt Romney, to figure out once and for all in which state does the Massachusetts Governor legally reside
Utah? Michigan? Massachusetts? New Hampshire? Willard seems to spend equal amounts of time in all of them. The man goes careening around this great country of ours like a fugitive, very suspicious if you asked me.

The real irony is, the democrats tried a variant on  the whole "birther route" on Romney back in 2002 insisting he was not a legal resident of the Commonwealth and thus could not run for Governor.
Likely he was not, but the courts decreed otherwise and you know the rest of the story. Birtherism is a gimmick that did not work in 2002 and won't work in 2012.