I watched a large number of Trump interviews about the BC, and he always said just the oppostie.
Can you point me to one where he said otherwise?
Trump constantly pointed out that Hussein wouldn't release the long form BC - and at the time he was right, Obama hadn't. That's what he's been going on about for weeks, that BHO wouldn't release it. He suggested that maybe there was something on it Hussein was hiding. Trump said he sent a team of crack investigators to find out what was going on and I believe suggested we'd all be surprised at the very interesting things they were digging up.
As it turns out, Hussein released his long form and there is nothing particularly noteworthy about it. What is this stuff his investigators supposedly dug up? That will amount to nothing. Trump has zilch, zero, nada and the one thing he was using to make a name for himself has now been eliminated as an issue.