WASHINGTON (Reuters) - U.S. House Speaker Nancy Pelosi on Thursday, seizing on a report from a nonpartisan congressional watchdog, accused the Trump administration of breaking the law in withholding aid for Ukraine that Congress had approved.

"The OMB, the White House, the administration broke - I'm saying this - broke the law," Pelosi told reporters. "This reinforces, again, the need for documents and eyewitnesses in the Senate," which will be holding an impeachment trial of President Donald Trump.

(Reporting by Susan Cornwell; Writing by Tim Ahmann, Editing by Franklin Paul)