House Appropriations Chairman Tom Cole wins Republican primary in Oklahoma: AP

Powerful Republican incumbent Rep. Tom Cole won his primary in Oklahoma on Tuesday night according to the Associated Press, defeating one of the toughest and most expensive challenger campaigns of his 22-year Congressional career.

Cole, who chairs the House Appropriations Committee, advanced to November's general election as the Republican nominee for Oklahoma's fourth Congressional district, securing more votes than wealthy businessman Paul Bondar. Cole has served as the district's representative for 10 terms.

Bondar, who has lived in multiple states but most recently moved from Texas, launched his unexpected campaign in March. He has focused on running a far-right campaign, with an emphasis on border security, inflation, and energy independence, according to ABC News. His biggest criticism for Cole was his support for foreign aid, including support for Ukraine in its war with Russia. 

The challenge was a surprise, given Cole's prominence on one of the House's top committees. Cole's reelection campaign has also been endorsed by influential politicians, including former President Donald Trump. 

Bondar has invested $4.3 million of his own money into his House campaign, according to AdImpact, while Cole has spent over $3.1 million in the race, according to the Federal Elections Commissions.