Rep. Kyrsten Sinema (D-Ariz.) is advancing her lead over GOP Rep. Martha McSally (Ariz.) in the Arizona Senate race, according to a new CNN poll.

Sinema is leading McSally by 7 points, with Sinema at 50 percent and McSally at 43 percent among likely voters in Arizona, the poll found.

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Recent polls have found Sinema leading McSally by a slimmer margin, with Sinema holding a 3 percent edge over her GOP opponent in a Fox News poll last week.

McSally and Sinema are facing off in a heated race to replace retiring Sen. Jeff Flake (R-Ariz.).