Two US Senators want Securities and Exchange Commission Chairman Paul Atkins to explain the sudden resignation of its enforcement director and whether her departure was related to cryptocurrency cases, including one touching on the Trump family’s ventures.

Richard Blumenthal, a Connecticut Democrat, sent a letter Monday seeking records related to the SEC’s cases against cryptocurrency companies and communications with top agency officials and ex-enforcement director Margaret “Meg” Ryan. Ryan quit on March 16 after slightly more than six months on the job.