The first-term lawmaker has repeatedly stirred controversy over inflammatory commentary.
On social media, she has voiced support for racist views, unfounded QAnon pro-Donald Trump conspiracy theories such as the lie that the 2020 election was stolen and calls for violence against Democratic politicians, including House Speaker Nancy Pelosi.
Last February, Senate Republican leader Mitch McConnell called her embrace of conspiracy theories and "loony lies" a "cancer for the Republican Party". The Democratic-led House that same month tossed her from her two committee assignments, the House Education and Labor Committee as well as the House Budget Committee.
In July, Twitter suspended Greene for a week after President Joe Biden urged tech companies to take stronger action against bogus vaccine claims that are "killing people". Twitter has defended its efforts to keep dangerous misinformation about Covid-19 off its site, saying it has removed thousands of tweets and challenged millions of accounts worldwide.
Among Greene's final tweets was one that falsely referenced "extremely high amounts of covid vaccine deaths", according to tweets stored in the Internet Archive.
Greene also boasted on Twitter about talking to the former president by phone. She said she had received Trump's permission to clarify his stance that he is against vaccine mandates though he encourages people to get the vaccine and booster. Trump was booed by some audience members in Dallas when he said he had received a Covid-19 booster shot.
The White House's top medical adviser, Dr Anthony Fauci, said the US has been seeing almost a "vertical increase" of new Covid-19 cases, now averaging 400,000 cases a day, with hospitalisations also up. The Omicron variant of Covid-19 has driven a surge in new cases across the country.