President Donald Trump continued his attack on Democrat Jon Ossoff in Atlanta’s 6th district race, which sent voters to the polls on Tuesday.

Trump tweeted that Ossoff, the Democratic frontrunner in a district that has been GOP since 1978, would be a “disaster” for Congress; is “VERY weak on crime and illegal immigration;” and “bad for jobs and wants higher taxes.”

On Monday, a robocall recorded by the president went out to 6th district voters, urging them to Republican.

MORE: Trump's tweets ring false in 6th district

Ossoff has dominated the polls and fundraising in the race to replace Tom Price, now secretary of the U.S. Department of Health and Human Services.

A total of 18 people are running, and Ossoff must earn more than 50 percent of the vote to avoid a June 20 runoff.

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In a Tuesday morning appearance on MSNBC’s Morning Joe, Atlanta Mayor Kasim Reed said, “We always like to say ‘Georgia’s on my mind,’ and it seems like Jon Ossoff is on the president’s mind as well.”

MORE: Atlanta's mayor predicts big win for Ossoff

Tuesday's race has national implications for Democrats, who are desperate for a win after a series of historic losses at the federal, state and local levels, nationwide. Trump carried the 6th district by less than two points over Democrat Hillary Clinton in the last election, one of the biggest swings of any congressional district in the nation.

The district includes portions of Atlanta, Brookhaven, Chamblee, Dunwoody, Doraville, Tucker, Sandy Springs, Roswell, Alpharetta, Johns Creek Milton and Mountain Park. It has been held by such GOP stalwarts as Newt Gingrich and Johnny Isakson.