ATLANTA -- U.S. House Speaker Paul Ryan held a rally on Monday for fellow Republican Karen Handel, who is in a June 20 runoff against Democrat Jon Ossoff.

Handel and Ossoff are seeking to replace Tom Price, who is now President Donald Trump's secretary for the U.S. Department of Health and Human Services, in metro Atlanta's 6th congressional district.

Ryan and Handel appeared together, along with several other GOP officials, at the Atlanta Marriott Perimeter Center in Dunwoody, a change from the originally planned event at the 5 Seasons Brewery in Sandy Springs.

PHOTOS: Paul Ryan holds rally for Karen Handel

The nation's most closely watched election has also become the most expensive congressional race in U.S. history. President Donald Trump himself gave an endorsement to Handel during a stop at a National Rifle Association conference in Atlanta last month.

The congressional race has attracted nationwide attention -- and donations -- as Democrats hope to fill a spot that has previously been held by high-profile Republicans Price, Johnny Isakson and Newt Gingrich since 1979.

Several dozens of protestors gathered outside the rally.

PHOTOS: Protests outside Handel rally


As Handel was leaving the ballroom, she was given a petition with more than 1,000 signatures that demanded she debate Ossoff.

Also, after the rally was over, a protestor in the back of the ballroom began shouting about the issue of health care, but was shouted down by others and escorted out.

FULL COVERAGE: Race to replace Tom Price