(WASHINGTON) — The National Archives and Records Administration has told the White House to keep each of President Donald Trump’s tweets, even those he deletes or corrects, and the White House has agreed.

The head of the archives, David S. Ferriero, told two Democratic senators in a letter last week that the White House has assured him it’s saving all Trump’s Twitter blasts.

The archives contacted the White House about the matter because the Presidential Records Act requires such correspondence to be preserved for history. Ferriero did not say when the agency contacted White House officials to remind them about the records requirement, but officials briefed the White House counsel’s office about the law on Feb. 2, according to the archivist’s letter to Sens. Claire McCaskill of Missouri and Tom Carper of Delaware.

The archivist’s letter, dated March 30, doesn’t describe precisely how the White House is saving Trump’s tweets. The Obama administration used an automated system to keep copies of President Barack Obama’s tweets.

McCaskill and Carper raised the issue of Trump’s tweets in early March following a spate of instances in which Trump had deleted or altered earlier tweets. The two senators had previously raised concerns about Trump’s tweets in a letter to White House counsel Don McGahn.

The two senators also pressed the archives for information about reports that some White House staffers had been ordered to avoid emails or use smartphone apps that do not preserve emails because of Trump administration concerns about leaks to the media. Ferriero told them…