Arizona GOP Senate candidate Kelli Ward on Tuesday said Arizona Sens. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R) and Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R), as well as her primary opponent Rep. Martha McSally Martha Elizabeth McSallyThe Hill's Campaign Report: Presidential polls tighten weeks out from Election Day Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' New ABC/WaPost poll finds Trump edging Biden in Arizona, Florida MORE (R), helped "contribute" to the death of an Iowa woman who was allegedly killed by an undocumented immigrant.

Ward called McSally an “amnesty advocate” and said that Arizona needs “true leadership in the Senate.”

"The lack of leadership & courage by open border senators like [Flake and McCain], & #amnesty advocate Martha McSally contribute to these senseless deaths," Ward tweeted on Tuesday, linking to an article about the murdered woman, Mollie Tibbetts. "We need true leadership in the Senate to #BuildTheWall & secure our borders!"

The lack of leadership & courage by open border senators like @JeffFlake, @SenJohnMcCain, & #amnesty advocate Martha McSally contribute to these senseless deaths. We need true leadership in the Senate to #BuildTheWall & secure our borders! #VoteWard #AZSEN https://t.co/dZIkQWB8YJ — Dr. Kelli Ward (@kelliwardaz) August 21, 2018

A spokeswoman for McSally said she would not "dignify" Ward's comment with a response, The Arizona Republic reported.

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National reports have closely followed the search for Tibbetts, who disappeared in July.

Her body was discovered on Tuesday, and police have charged Cristhian Bahena Rivera with her murder. Rivera is a Mexican national in the country illegally, fueling talking points for border security advocates.

McCain and Flake have both long advocated for comprehensive immigration reform, even collaborating with Democrats in the 2013 "Gang of Eight," a group of lawmakers dedicated to passing legislation on the issue.

McCain has been undergoing treatment for an aggressive form of brain cancer at his home in Arizona.

Ward has frequently targeted McSally on the issue of immigration and has positioned herself as a fervent supporter of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE and his policies.

An August poll showed McSally with an 8-point lead over Ward heading into the Aug. 28 primary.

This week, Ward hit the road for a "Road to Victory" bus tour alongside Arizona Rep. Paul Gosar Paul Anthony GosarPelosi must go — the House is in dire need of new leadership LWCF modernization: Restoring the promise Trump tweets his people have all left Drudge MORE (R), Sen. Rand Paul Randal (Rand) Howard PaulThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts MORE (R-Ky.) and Rep. Steve King Steven (Steve) Arnold KingTrump, Biden deadlocked in Iowa: poll GOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP MORE (R-Iowa).