Stormygate could turn into a big deal for Mueller's Trump probe

If the affair did happen, Trump and Cohen’s denials could be used by Mueller to cast into doubt the reliability of their claims about other areas of his investigation.

“This information would go generally to both of their credibilities and, more specifically, to both of their potential modus operandi for trying to control information that might be adverse to the president’s interests,” said Stephen Braga, a white-collar criminal defense professor at the University of Virginia’s law school.

Braga also said Mueller might be able to use the potential threat of prosecuting Cohen for actions related to Daniels as leverage to get him to cooperate in the ongoing probe of the Trump campaign.