Let ‘er backfire Hoss.
A backfire is an explosion in the exhaust system.
Caused by gas fumes on the way out.
Why would Trump be doing the investigation?
Most likely he’s going to find out about the social security cards of old people Obama has. They were born in the 1890s and applied for social security in the late 1970s to get medical benefits. It appears they were targeted because it was assumed they would not live much longer. So, the SSN were not expired, the name and date of birth was simply changed to Obama’s. This here is most likely what Trumps going to get him for first.
But, what’s he going to do with the info?