Maybe they were trying to get him American citizenship.
There wasn't any need to. Barack's mother was an American citizen so even if he was born on Mars, he still would have been an American citizen. That would have been the same case for John McCain who was born in Panama. And again, why would they try to cover up his citizenship back in 1961 when there was no reason to at the time.
At this point and time, people will argue to the bitter end regardless of what paperwork or information is shown. Show a document and they'll declare it a fake....have someone state that they remember him being born in America and they'll say that they are lying. It doesn't matter
The only reason Trump is saying all of this is obviously to pander more votes from the Tea Party. Anyone who is running for president should steer clear of this matter or they are going to get laughed out of the running