Barr publicly split with Trump after Biden won the 2020 election by undermining Trump's false claims that the race was rigged through widespread fraud.
Since January, seven other Russian energy executives have died under unusual circumstances, according to reports by Russian and international news agencies.
The Department of Justice is conducting a criminal probe into the transfer of White House records to Mar-a-Lago when former President Donald Trump left office.
The wife of Supreme Court Justice Clarence Thomas also urged the Trump White House chief of staff to try to overturn President Joe Biden's election win.
Fulton County, Georgia, District Attorney Fani Willis is investigating possible 2020 election interference by former President Donald Trump and his allies.
Health officials say the U.S. is in a much stronger position due to new boosters, antiviral treatments, therapeutics and immunity from previous infections.
Crist's move came as DeSantis and former President Donald Trump are both rumored to be considering a run for the White House in the next election cycle.
Donald Trump wants a special master to examine documents seized from Mar-a-Lago in an FBI raid, which the DOJ says found scores of classified documents.