He didn't say that, he said this.
DJT
"“I think what happened is, you know, that white stuff that they happened to find, which happened to be cocaine in the White House, I don’t know, I think something’s going on there, because I watched this State of the Union, and he was all jacked up at the beginning. By the end, he was fading fast. There’s something going on there. I want to debate. And I think debates, with him, at least, should be drug-tested. I want a drug test.”