Are President Trump's global business dealings illegal?

Photo: Plaintiffs Diane Gross and Khalid Pitts, co-owners of Cork Wine Bar, sit with DC attorneys Scott Rome (L) and Mark Zaid (R) during a news conference at the National Press Club held to announce the filing of a lawsuit against U.S. President Donald Trump and his D.C. hotel company alleging unfair competition in Washington, U.S., March 9, 2017. (Kevin Lamarque/ Reuters)