It started with a Tweet from a QAnon supporter at 2:09 in the morning: #SubpoenaObama.
...
By the next day, May 14, the hashtag had apparently caught the eye of President Trump, who used Twitter to urge Republican Sen. Lindsey Graham of South Carolina -- chairman of the Senate Judiciary Committee -- to call Obama to testify. "He knew EVERYTHING," Trump tweeted, referring to Obama. "Just do it."
Later that day, Graham announced a probe into the matter -- although he begged off Trump's request to subpoena Obama himself.

It started with a Tweet from a QAnon supporter at 2:09 in the morning: #SubpoenaObama. ... By the next day, May 14, the hashtag had apparently caught the eye of President Trump, who used Twitter to urge Republican Sen. Lindsey Graham of South Carolina -- chairman of the Senate Judiciary Committee -- to call Obama to testify. "He knew EVERYTHING," Trump tweeted, referring to Obama. "Just do it." Later that day, Graham announced a probe into the matter -- although he begged off Trump's request to subpoena Obama himself.