“The case” is the Republican Party trying to damage Biden’s reelection campaign. Remember back when Kevin McCarthy bragged about creating a congressional investigation into Hillary Clinton regarding the Ansar al-Sharia attack on a State Dept building in Libya, aka “BENGHAZI!”, for the express purpose of damaging her reputation?

After the first five Republican investigations found no evidence of wrongdoing by senior Obama administration officials, Republicans in 2014 opened a sixth investigation, the House Select Committee on Benghazi, chaired by Trey Gowdy. This investigation also failed to find any evidence of wrongdoing by senior Obama administration officials. A possible political motive for the investigation was revealed on September 29, 2015, when Republican House majority leader Kevin McCarthy, then vying to become Speaker of the House, told Sean Hannity on Fox News that the investigation was part of a "strategy to fight and win,’ adding “Everybody thought Hillary Clinton was unbeatable, right? But we put together a Benghazi special committee, a select committee. What are her numbers today? Her numbers are dropping.”