Trump did not expound on his unfounded accusations about 30-year-old Jon Ossoff, but the president's Twitter broadside a day before the special primary underscores how big a Democratic victory would be nationwide and in Atlanta's historically conservative northern suburbs.
Ossoff, who has used anti-Trump sentiments nationally to collect at least USD 8.3 million in campaign contributions, countered yesterday that Trump is "misinformed," but added that he's "glad the president is interested in the race."
The Georgia district, represented previously by Trump's new health secretary, Tom Price, encompasses reliably Republican territory across parts of three metro Atlanta counties. But Trump underperformed here in November, barely edging Democrat Hillary Clinton and falling short of a majority. In 2012, by contrast, Republican nominee Mitt Romney garnered more than 60 per cent of the vote.
Even the leading Republican candidates concede that Ossoff will lead an 18-candidate "jungle primary" that places all candidates on the same ballot. The question is whether he can win an outright majority.
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"Republican voters are not going to sit by and let this district go to a Democrat," Handel said.
But the mere possibility has national observers watching closely, particularly because the district is dominated by the kind of suburban voters Democrats need to have any chance at a House majority.
The scrutiny grew even more intense after last week's special congressional election in Kansas, where Republican Ron Estes won by just single-digits in a Wichita-based district that Trump had carried easily.
Ossoff did not mention his exchange with Trump or call the president by name at all during his remarks.
Handel, a GOP establishment favourite who served previously as Georgia secretary of state, also has worked to localise the race.
That has made her an outlier among top Republican contenders.
Wealthy technology executive Bob Gray has cosied up to Trump from the start, running ads that show him, literally, draining a swamp -- a nod to one of Trump's campaign signatures. Gray pledges to be a "willing partner" for the new administration.
Former state Senator Judson Hill is touting his endorsement from Florida Senator Marco Rubio, one of a gaggle of Republican presidential hopefuls that Trump vanquished.
Ossoff, meanwhile, has tried to capitalise on intense anti-Trump sentiments among liberals, while still coaxing disaffected independents and moderate Republicans who normally wouldn't consider voting Democratic.
Responding to Trump's tweet, Ossoff said in his statement that he is "focused on bringing fresh leadership, accountability and bipartisan problem solving to Washington."
National Republicans have sought to blunt Ossoff's momentum by tying him to national Democrats, particularly House Minority Leader Nancy Pelosi. The California Democrat is an unpopular figure in this Georgia district that once sent former House Speaker Newt Gingrich to Capitol Hill.
Ossoff's quest for an outright victory may depend on low Republican turnout.
Almost 55,000 voters cast early ballots, according to the Georgia Secretary of State. Various campaigns say they expect somewhere between 100,000 and 125,000 total votes out of nearly 440,000 registered active voters. The lower the turnout, the greater the chance that Ossoff's enthusiastic core of support would clear the majority threshold.