A long-shot legal fight to challenge President Joe Biden’s withdrawal from the 2024 election race is now moving forward after his historic decision to bow out on Sunday.

The conservative Heritage Foundation’s Oversight Project has been leading the threat of legal action, publicizing a June 21 memo on the matter immediately after last month’s presidential debate, the event that catalyzed the president’s decision to end his campaign. The memo warned of a “contentious path” to replacing Biden on the ballot, though questions linger as to whether they will bear fruit as Biden steers Democrats to coalesce around Vice President Kamala Harris.