FILE PHOTO: The U.S. flag is unfurled at sunrise as part of the 18th annual September 11 observance ceremony at the Pentagon in Arlington, Virginia, U.S., September 11, 2019. REUTERS/Al Drago

WASHINGTON (Reuters) - U.S. House Democrats on Monday issued subpoenas to the Pentagon and the White House budget office as part of their impeachment inquiry, requesting documents related to U.S. President Donald Trump’s decision to withhold military assistance for Ukraine.

In a pair of subpoenas, the House intelligence committee said the Department of Defense and the White Office of Management and Budget must turn over the documents by Oct. 15.