Poll: Arpaio statistically tied with McSally in GOP primary for Arizona Senate

Former Arizona sheriff Joe Arpaio is in a statistical tie with Rep. Martha McSallyMartha Elizabeth McSallyHouse GOP returns to Washington after sobering midterm losses Overnight Defense — Presented by Raytheon — First lady's office pushes for ouster of national security aide | Trump taps retired general as ambassador to Saudis | Mattis to visit border troops | Record number of female veterans to serve in Congress Election Countdown: Lawsuits fly in Florida recount fight | Nelson pushes to extend deadline | Judge says Georgia county violated Civil Rights Act | Biden, Sanders lead 2020 Dem field in poll | Bloomberg to decide on 2020 by February MORE (R-Ariz.) in the Republican Senate primary in Arizona, according to a new poll.

The ABC15/OHPI poll shows 85-year-old Arpaio, who on Tuesday announced his plans to run for the Senate seat, has 29 percent support in the race.

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.

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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 John TrumpMeet the lawyer Democrats call when it's recount time Avenatti denies domestic violence allegations: 'I have never struck a woman' Trump names handbag designer as ambassador to South Africa 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.