The district went for Democratic candidate Hillary Clinton in the 2016 presidential race by 5 points, but Ms. McSally easily won her re-election by 14 points that same year. Arpaio's entry could hurt her chances.
"Like in almost every other state facing a Senate election this cycle, the Arizona Republican primary will be nasty, expensive and very long", David Bergstein, a Democratic Senatorial Campaign Committee spokesman said Friday in a written statement.
Political consultant Mike Noble with MBQF Consulting said he expects Arpaio to continue "wrapping both arms around" the controversial immigration policies that garnered his fame and self-styled claim to be "America's toughest sheriff".
Democrats in the Senate primary include Deedra Abboud, Bob Bishop, Cheryl Fowler, Chris Russell and U.S. Rep. Kyrsten Sinema, who is considered the front-runner.
U.S. Rep. Martha McSally, R-Ariz., announced Friday, Jan. 12, 2018, that she's running for U.S. Senate to fill the seat held by Sen.
Worldwide PC Shipments Dip 2 Per Cent For Q4 2017
It also claimed that organizations were shifting their attention back to notebooks, with the tablet market in a state of flux. IDC said 2017 marked the most stable year for the PC market since 2011 with annual shipment volume of 259.5 million units.
Zachery Henry, a Ward spokesman, said members of the campaign don't believe Arpaio would split the GOP vote to the detriment of Ward. "She opposed Donald Trump as a candidate and has undermined him as president", Ward campaign chair Ed Rollins told Newsweek.
McSally has courted Trump's support in recent months while still presenting herself as middle-of-the-road. But she removed his name from her list of endorsements after Trump split with Bannon over comments in a newly published book critical of the president. She wasn't done though, also explicitly tying herself to Trump.
Arpaio's announcement led some people to wonder if he is serious about a Senate bid or simply seeking publicity. He flirted with running for governor no fewer than five times over the years before finally abandoning the idea. He was convicted of criminal contempt of court past year for defying an order to stop officers from detaining people based exclusively on suspicion of their immigration status. Inmates were occasionally forced to wear pink underwear and sleep in sweltering "tent cities" as punishment. His office also failed to adequately investigate more than 400 sex-crime complaints. He also said the president had not asked him to run for the Senate.
Mr Trump has yet to endorse in the race. "Should I take an oath as your senator, raising my right hand again, you can be certain of this, I will give my all to protecting our country and to advancing the American leadership and American values in a world that desperately needs them both, and will speak candidly, maybe a little bluntly at times, but always truthfully and never in droning, empty platitudes of the politically correct".
"But I would not being doing this if I thought that I could not win", he added.