(EDGE) A month after stating Caitlyn Jenner is welcomed to use the ladies' room at Trump Tower, presumptive GOP presidential nominee Donald Trump blasted the idea of gender neutral facilities on the grounds that they would cost "hundreds of billions of dollars."

Trump continued to play both sides of the transgender restroom issue Monday when, during a broadcast of Fox News' "The O'Reilly Factor," he decried establishing gender neutral restrooms.

"It would be unbelievably expensive nationwide," Trump told O'Reilly. "It would be hundreds of billions of dollars. It would be an unbelievably expensive thing to do. I think our country would rather have us spending money on other things. The number of people we're talking about is really a small number."

O'Reilly asked, "What about human rights?"

"Well I don't know about human rights, but it would be an unbelievably expensive thing to do," Trump replied.

Of the Obama administration's directive this month regarding public schools and access to restrooms for transgender students, Trump passed the buck from the federal government to the states.

"I would generally speaking leave it to the states to decide," he said. "Obama's getting into a very tricky territory. We have to protect everybody, even if its one person. But this is such a tiny part of our population. I would really leave it up to the states."