House Oversight and Reform Committee Chairman Elijah Cummings said he’ll subpoena documents on April 15 from an accounting firm tied to President Donald Trump.

“The committee has full authority to investigate whether the president may have engaged in illegal conduct before and during his tenure in office,” Cummings said in a memo April 12 to committee members along with a copy of the subpoena to Mazars USA LLP.

While Attorney General William Barr plans to make public next week a redacted version of Special Counsel Robert Mueller’s findings from his investigation into Russian interference in the 2016 election, the move...