The Independent Community Bankers of America sued the Office of the Comptroller of the Currency, alleging that allowing cryptocurrency companies to obtain limited national trust bank charters exceeds the agency's congressional authority. The group filed the lawsuit Friday in the US District Court for the District of Columbia. ICBA president and CEO Rebeca Romero Rainey said the group is asking the court to return the OCC to its statutory limits. The trust bank charters do not allow companies to accept deposits or make loans. The OCC had not responded to a request for comment by publication.