Michael Cohen raised a litany of allegations against his former boss, Donald Trump, in explosive testimony before Congress this week, implicating the president and his inner circle in potential criminal wrongdoing on multiple accounts.

Now House Democrats plan to use Cohen’s revelations as a blueprint to summon key witnesses and pursue investigative avenues they say their Republican counterparts have ignored. That is likely to trigger a steady flow of public hearings involving those closest to the president as Democrats hunt for more damaging revelations.