Republican voters also selected a candidate in a campaign for a Minnesota congressional seat in a district that went for President Donald Trump in 2016 by a wide margin and is currently represented by endangered Democratic Rep.

Bernie Sanders of Vermont and Elizabeth Warren of Massachusetts, along with other progressive leaders and organizations, led by Justice Democrats, also rallied for Omar ahead of the primary.

GOP candidate who embraced QAnon conspiracy theory wins Georgia runoff

A Republican primary runoff for Georgia's 14th Congressional District, which is situated in the northwest corner of the state, drew national attention as a result of Greene's promotion of the wild and unsubstantiated conspiracy theory known as QAnon.

Greene has repeated and promoted QAnon theories and phrases, praising the mythical Q as a "patriot" in a video from 2017 and describing the conspiracy theory as "something worth listening to and paying attention to."

Although the theory is nebulous enough to invite all kinds of interpretations from its adherents, at its core QAnon claims that Trump has been secretly fighting to bring down a cabal of Satan-worshipping pedophiles that has infiltrated all levels of the US government and other elite institutions.

Greene has also faced a backlash over the revelation of past Islamophobic and anti-Semitic comments, including saying that there is "an Islamic invasion into our government offices" and calling the progressive billionaire activist George Soros, who is Jewish, a "Nazi." House GOP leaders responded with condemnation following a report in Politico surfacing racist remarks and other incendiary comments in June.

Despite that, Greene prevailed on Tuesday in a primary runoff against GOP opponent John Cowan, raising the question of what national Republicans will do in response.

Tom Graves, who has served in the House since 2010 and announced last year that he would not seek reelection.

Republicans pick a nominee for the Trumpiest district represented by a Democrat

In Minnesota, Republican voters picked their candidate in a campaign to flip a House seat, with CNN projecting that Michelle Fischbach will win Minnesota's 7th Congressional District GOP primary.

The district is currently represented by House Agriculture Chairman Collin Peterson, a Democrat.