The seat has been solidly Republican, but Democrat Ossoff got 48 percent in a crowded April 18 election to nearly win the seat. Because Ossoff didn't get a majority, he and Handel — who finished second with 20 percent — will compete in the June 20 runoff.
As it became clear Ossoff had a chance to win the seat outright in the April 18 election, Trump recorded a robocall and tweeted against Ossoff in hopes of forcing a runoff. Trump also attended a fundraiser for Handel when he was in Atlanta for the NRA convention last month.
The Handel-Ossoff campaign is the most expensive House race in history, Politico recently calculated, with candidates, parties and outside groups topping $29.7 million in spending.
The previous record was then $29.6 million spent in a 2012 race in which Democrat Patrick Murphy unseated Republican Rep. Allen West for the Palm Beach-Treasure Coast seat that Mast now holds.