Federal prosecutors in Manhattan are investigating whether anyone in the Trump Organization violated campaign-finance laws, in a follow-up to their conviction last month of Michael Cohen, according to a person familiar with the matter.

The inquiry, not previously reported, shows that the Manhattan U.S. attorney’s office doesn’t intend to stand down following the guilty plea from Trump’s longtime personal lawyer. Manhattan prosecutors are working on a parallel track to U.S. Special Counsel Robert Mueller, who is tasked with examining Russian interference in the presidential election and who is referring other matters as they arise to appropriate sections of the Justice Department.