<img src="https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/HGWFDEBKOQI63KIK7TSACXP4R4.jpg&w=1024" /><br>The event in the East Room will revive a tradition of presidents welcoming their predecessors — regardless of party — back to the White House.