A staffer on Trump's 2016 presidential run, Biundo reportedly coveted a job in the West Wing following Trump's upset win over Hillary Clinton.
Arrington, now a state representative, is challenging Sanford for the 1st Congressional District seat.
Then in the tenth, state Sen.
With 98-percent of precincts reporting, Arrington led the race by about 2,500 votes - enough to avoid a runoff and secure the Republican nomination.
In conceding the race, Sanford said he was comfortable with the positions he took on Trump.
Sanford had been critical of Trump at times, saying he "fanned the flames" of intolerance and decrying his disregard for facts.
"There's a temptation, given the American public's frustration with the political system, .to throw the baby out with the bathwater, and 'let's discard all these institutions that have served us incredibly well for 200+ years, '" Sanford said.
Nadal to face Thiem for French Open title
Nadal's introduction included a year-by-year accounting of every time he'd already won the French Open. Thiem was quick to respond, reeling off the next three games to take the set in 46 minutes.
Mark Sanford nurtured an independent streak, reportedly branding the president's imposition of steel and aluminum tariffs "an experiment with stupidity".
The Argentina reference concerned Sanford's extramarital affair with an Argentine woman while he was governor, which he publicly acknowledged in 2009.
Ousted Rep. Mark Sanford (R-SC) said his fellow Republicans are "running for the hills" because they can't deal with President Trump's "lies". Less than three hours before polls closed Tuesday, Arrington was rewarded for her loyalty with an tweeted endorsement from the president, who said Sanford was "very unhelpful" and "nothing but trouble".
This is the first race Sanford lost over his 25 years in politics. In Virginia, a Republican known for his ardent defense of Confederate symbolism, Corey Stewart, won the Republican primary to face Democratic Sen. It has voted Democrat in the three elections since.
On the other side of the aisle, people said State Rep. James Smith is their Democrat choice.
Sanford has called Trump's tariffs on aluminium and steel imports "an experiment in stupidity", said Trump has done some "weird stuff" in office, and even suggested that Trump was "partially" to blame for divisive rhetoric that led to the congressional baseball practice shooting past year.
In defense of his stance on Trump, Sanford has said he criticizes anyone regardless of party if they deserve it. She is tough on crime and will continue our fight to lower taxes.
In the most recent count I've seen, Arrington is at 50.5 percent, only about 300 votes clear of a run-off (if my math is correct).
"Furthermore, it could also be that primary voters liked Katie Arrington's approach, though I have no empirical evidence to back this up at this time".
In North Dakota and Nevada, voters will set the stage for two of the most competitive U.S. Senate races in November, when Democrats must pick up two seats to capture a Senate majority.