Nearly six months after Joe Biden left the White House, Senate Republicans are still scrutinizing his presidency, kicking off the first in what’s expected to be a series of congressional hearings this year on his mental fitness in office.

Republicans on the Senate Judiciary Committee brought in three witnesses Wednesday — none of whom served in Biden’s administration — to scrutinize his time in office, arguing that Biden, his staff and the media must be held accountable. Democrats boycotted the hearing and criticized Republicans for “arm chair diagnosing” Biden when the committee could be looking into serious matters.

Sen. John Cornyn of Texas, who co-chaired the hearing, said that they will aim to “shine a light on exactly what went on in the White House during Biden’s presidency.”