It's reasonable to assume that if he had evidence he would have presented it. He presented none. Even if wre ignore the fact that Trump's false public statement outnumber his true ones by a huge porportion, The fact that Trump's word is the only thing supporting his claim, and there are numerous other sources indicating that he is lying, is sufficient reason to assert that he is lying.

But we are talking nuances here. I think we understand each other's points, and should probably agree to disagree.