I have enough confirmed detail to write an accurate, neutral summary.

SUMMARY:
Florida's Attorney General, James Uthmeier, has announced he is launching an investigation into Dr Anthony Fauci, the former US government's top infectious disease official, after Fauci's appearance at a Senate hearing this week. The move follows Fauci's decision to repeatedly invoke his Fifth Amendment right against self-incrimination rather than answer questions about his role in the government's response to the Covid-19 pandemic, a stance that drew sharp criticism from Republican lawmakers.

The hearing took place on Wednesday, with reports indicating Fauci declined to testify on pandemic-related matters roughly 100 times during the session. Florida Republicans used the appearance to renew criticism of Fauci's handling of the pandemic response, and Uthmeier's announcement of a state-level probe followed shortly afterwards. Specific details of the investigation's legal basis and precise scope have not yet been fully disclosed.