Charlie Kirk "inspired a generation" of young conservatives and would be difficult to replace, a close friend and colleague said as the conservative movement continued to grapple with the death of the Turning Point USA co-founder.

Andy Surabian, a longtime political adviser to Vice President JD Vance and Donald Trump Jr., told Fox News Digital that Kirk "was one of one" and that his greatest legacy would be the young conservatives he mobilized. Kirk, who rose to prominence as a culture warrior and media star, was shot and killed this past Wednesday during a college campus event in Utah. Authorities have said a suspect has been taken into custody.

Surabian, who said he and Kirk first met in 2018, described a close professional and personal bond. "We would constantly gut check things with each other….both of us respected the political instincts of the other," Surabian said. He recounted that Kirk introduced him to Vance before Vance's successful 2022 Senate campaign in Ohio, leading to a swift decision to work together.

"I was skeptical, but since Charlie was vouching for him, I was on the phone with JD within the hour," Surabian wrote in a social media post. "90 minutes later, after JD and I had hit it off and decided to work together, Charlie excitedly told me I wouldn't regret it — and he was certainly right about that."

Surabian highlighted a range of attributes that he said set Kirk apart: fundraising prowess, charisma, debating skill, media talent, the ability to organize students and deliver messaging with unusual effectiveness. "Very rarely do figures come along who can put all those things together the way Charlie put it together," Surabian said, adding that Kirk was "highly intelligent" and "a fundamentally decent person."

Vice President JD Vance walks toward Air Force Two alongside Charlie Kirk's casket on the tarmac in Salt Lake City

Kirk co-founded Turning Point USA at age 18 and built the organization into a prominent conservative youth group and a mobilization engine for Republican campaigns, including last year's presidential contest. He cultivated a national profile through media appearances, rallies and digital outreach, becoming an influential voice among MAGA-aligned conservatives.

Surabian said Kirk still had room to grow as a national conservative figure. "Despite how influential he became, despite how famous he was, I do absolutely believe that he was still at the start of his rise and not at the end of it," Surabian said. He added that Kirk had "the potential to be the next Rush Limbaugh," a comparison Surabian said underscores the scope of Kirk's reach.

Kirk's death prompted an outpouring of tributes from conservative leaders and allies. President Donald Trump announced that a suspect had been taken into custody in the killing. Mourners gathered at Turning Point USA headquarters and other locations to remember Kirk's role in shaping conservative youth politics.

People gather outside Turning Point USA headquarters after Charlie Kirk's death

Surabian said the most enduring measure of Kirk's influence would be the people he mentored. "This is the thing that Charlie would be proudest of, it’s the thing that makes me so proud of Charlie," Surabian said. He expressed doubt that any single figure could replace Kirk, while predicting that many of those Kirk inspired could carry forward elements of his approach to conservative organizing and media.

Authorities continue to investigate the circumstances surrounding the shooting. In the wake of Kirk's death, political operatives, donors and activists are reassessing the movement's leadership dynamic as they mourn a figure who played an outsized role in recent Republican politics.