Former Arizona sheriff Joe Arpaio is in a statistical tie with Rep. Martha McSallyMartha Elizabeth McSallyKelly raises million in third quarter Ruben Gallego is left's favorite to take on Sinema Texas not hiring private contractor for election audit MORE (R-Ariz.) in the Republican Senate primary in Arizona, according to a new poll.
McSally, 51, who is also expected to jump into the race soon but has not made a formal announcement, has 31 percent support, according to the poll.
Former state Sen. Kelli Ward, 48, has 25 percent support in the poll.
The poll was conducted Tuesday among 504 likely Republican voters. Its margin of error is 4.36 percentage points.
Arpaio gained popularity among immigration hard-liners during his time as Maricopa County sheriff, proudly calling himself "America's toughest sheriff" and touting a strict approach to border security.
President TrumpDonald TrumpTrump criticizes Justice for restoring McCabe's benefits Biden: Those who defy Jan. 6 subpoenas should be prosecuted Hillicon Valley — Presented by LookingGlass — Hackers are making big money MORE pardoned Arpaio last year after he was convicted of ignoring a court order related to racial profiling in his office.
McSally, who is expected to jump into the race soon, could stand to benefit from Ward and Arpaio's similar constituencies if the candidates split each other's votes.