"We will see what the final numbers foretell, but I've always been a realist, and at this point, based on the numbers I see, I think that I'll end up losing this election", Sanford said shortly before 11 p.m. Tuesday night.
McMaster was the top vote-getter in primary voting but failed to win the 50 percent necessary to avoid a runoff. State Attorney General Janet Mills is expected to win the Democratic nomination, while business executive Shawn Moody is the frontrunner in a close, four-person race for the Republican nomination.
Tuesday afternoon, the President endorsed her bid for Congress in a Tweet criticizing Sanford.
In June 2009, Sanford disappeared from public view for six days and later claimed that he had been hiking on the Appalachian Trail.
Sanford has never lost an election in SC, including two terms in the U.S. House after the affair surfaced. Alabama's Martha Roby was forced to a runoff.
Nevada also has an interesting governor's race, with six Democrats and seven Republicans vying to run for a position that's been controlled by the GOP for almost 20 years.
Sanford was defeated by state Rep. Katie Arrington, who spent her campaign blasting Sanford a "Never Trumper".
However, given Sanford was able to make a comeback, but not survive his attacks on President Donald Trump, Scarborough deemed GOP primary voters to be a "Trumpist cult".
Democrats need to gain 23 seats to win the majority in the House.
Dénouement espagnol proche pour les migrants de l'Aquarius
Borrell, assurant que les autorités italienne et maltaises avaient déjà remercié le gouvernement espagnol pour cette proposition. Depuis, Edouard Philippe a indiqué que la France était " prête à aider " l'Espagne pour " accueillir " des migrants .
He tweeted: "Mark Sanford has been very unhelpful to me in my campaign to MAGA".
Elsewhere, voters made their picks for key November elections for Senate, House and governor in Virginia, Maine, Nevada and North Dakota, on a day with considerably less drama and lower stakes than primaries in recent weeks.
Then the tweet got personal, with Trump saying Sanford is "better off in Argentina".
"You don't fire the coach and hire a rookie", McMaster said in a speech after results came in, touted business investments under his leadership and the Trump endorsement.
On Tuesday, three women - Elaine Luria, Abigail Spanberger and Jennifer Wexton - won Democratic primaries. "He is better off in Argentina".
In North Dakota, Republican Representative Kevin Cramer easily won the nomination to challenge Democratic Senator Heidi Heitkamp.
To date, 476 women have filed to run for the House in 2018, according to the Center for American Women and Politics at Rutgers University, surpassing the 272 who filed in 2016.
Incumbent McMaster is seeking to be elected to remain in office after taking Nikki Haley's position in 2017 when she was appointed by Pres. Donald Trump to serve as UN Ambassador.
Trump congratulated Corey Stewart, his onetime Virginia campaign chairman and an immigration hardliner, for winning a GOP primary that will put him against incumbent Democratic Sen.
Perhaps sensing he was in political trouble, Sanford started running broadcast television ads in early May and continued until the primary. Dean Heller, possibly the most vulnerable Republican in the Senate, and Democratic Rep. Jacky Rosen.