From nongovernmental advocacy groups to elected officials, plaintiffs challenging President Donald Trump over his business holdings are lining up in federal courts.

On Wednesday, nearly 200 lawmakers, all of them Democrats, filed a lawsuit alleging Trump is continually violating the Constitution's emoluments clause by receiving payments to his businesses from foreign governments. The newly famous clause, along with a domestic counterpart, is the subject of three such lawsuits against the president. A fourth lawsuit, filed on behalf of a local Washington, D.C., restaurant against Trump in his personal capacity as well as the Trump Organization, takes a different route, but still argues the president may not legally maintain ownership of his businesses while in office.

Scott Rome, a lawyer who helped bring that case and principle at The Veritas Law Firm in D.C., said he's hopeful at least one of the challenges will succeed.