The Senate Sergeant at Arms has approved the encrypted messaging app Signal for lawmakers and staff.

The move was first noticed by the tech publication ZDNet in a letter from Sen. Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.) thanking Sergeant at Arms Frank Larkin for the decision.

In a letter last week, the senator thanked Larkin for improving the security of Senate websites and also praised him for “the recent announcement by your office that the end-to-end encrypted messaging app Signal is approved for Senate staff use.”

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ZDNet reported Tuesday that the approval for Signal took effect in March but appears to have flown under the public radar.

Recently, employees at the Environmental Protection Agency and White House both came under fire for either using Signal or the competing app Confide. Both of those agencies fall under different, stricter records laws than Congress.