It's election day, as voters in Ohio's 12th District decide the final congressional contest before November's national midterms.
Trump was asked by reporters about the OH race at a dinner with business leaders at his golf club in Bedminster, N.J., and simply replied, "We'll see what happens".
Voters on Tuesday were choosing between Balderson, a state senator, and O'Connor, the Franklin County recorder, to complete the term of a Republican who retired in January. Recent polling has the race in a statistical tie.
"Voters in Ohio's 12th Congressional District picking a new congressman", King said on CNN's "Inside Politics".
Balderson gave a speech thanking Trump for his help in campaigning, saying he himself had "big shoes to fill" in Congress and that he would "do everything I can to make America great again". Strong on Crime, Border & Military.
Whoever wins Tuesday will hold the seat until early 2019.
"Kris Kobach, a strong and early supporter of mine, is running for Governor of the Great State of Kansas", Mr. Trump wrote Monday on Twitter. "Tomorrow we rest and then we keep fighting through to November", O'Connor told supporters at a post-election party. Ohio Governor John Kasich, a Trump critic, endorsed Balderson and Vice President Mike Pence visited.
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If the O'Connor wins, or if Balderson wins narrowly, the media narrative will be that Trump is no king-maker and he can't save the Republican Party from an oncoming blue wave in November. Described by campaign operatives as a "Whole Foods" district, the largely suburban region features a more affluent and educated voter base than the typical Trump stronghold.
According to data obtained by TIME, Balderson had only spent $507,206 on television ads as of August 3, while O'Connor had spent over $2 million.
Democrats, meanwhile, have been attacking Balderson by casting his support of tax cuts as threats to Social Security and Medicare. The Republican campaign arm and its allied super PAC were forced to pick up the slack, spending more than US$4 million (NZ$5.9m) between them. The field includes Fayrouz Saad, who would be the first Muslim woman in Congress.
The president's Senate pick, John James, whom Trump called a "potential Republican star", also won.
And in suburban Seattle, three Democrats are vying in a jungle primary for the seat held by another retiring Republican, Rep. Dave Reichert.
But the Ocasio-Cortez and Bernie Sanders-backed Abdul El-Sayed's bid for MI governor fell short, CNN projects, as the establishment favorite, former state Senate Minority Leader Gretchen Whitmer, nabbed the Democratic nomination and a November date with Republican Attorney General Bill Schuette. He would join Tim Scott of SC as the only black Republican senators if he wins in November.
President Trump campaigned for Balderson, a 56-year-old state senator, this past weekend in an effort to energize the GOP base, but some Republicans anxious that the president's appearance could have had an adverse effect by motivating voters who don't like Trump to come out for O'Connor.