It was apparently Musk’s first visit to the Capitol in the 118th Congress.
Trump's campaign team had petitioned the company to reinstate his account in mid-January, saying that a continued ban would amount to Meta silencing "Mr. Trump's political voice."
The announcement comes as advertisers have fled the platform in droves after Elon Musk's takeover last October.
The tech billionaire had faced a wave of criticism from news publications, lawmakers and advocates after he abruptly banned the accounts on Friday.
With Thursday's action, the Supreme Court has now received petitions from two conflicting split circuit rulings related to state laws that seek to force platforms to carry certain speech.
Elon Musk continues to unravel existing content moderation policies with the disbanding of its outside council.