As the sibling comment said, maybe things only came to Obama's attention recently. There could be information that intelligence personnel were pursuing but fel

As the sibling comment said, maybe things only came to Obama's attention recently. There could be information that intelligence personnel were pursuing but felt like they needed to escalate to the president given other information that has come to light. Could be people with a grudge. Could be that they were pursuing rumors but then recently found more substance to those rumors. All things considered I think there's a decent possibility that President Trump has more skeletons in the closet that haven't been outed yet.