ATLANTA, GA - DECEMBER 18: Colin Kaepernick #7 of the San Francisco 49ers looks on from the sidelines during the second half against the Atlanta Falcons at the Georgia Dome on December 18, 2016 in Atlanta, Georgia. (Photo by Scott Cunningham/Getty Images)

Kid Rock doubles down on Colin Kaepernick criticism: "F**k ANYONE who takes a knee or sits during our national anthem!"

Several teams have passed on Kaepernick this offseason as many consider him to be a potential distraction given his constant media coverage.

During a performance back in August, musician and Michigan Senate candidate Kid Rock reportedly took a shot at NFL free agent quarterback Colin Kaepernick while performing his song "Born Free," according to the Des Moines Register.

Videos by FanBuzz

"Football's about ready to start," he said. "You know what? (expletive) Colin Kaepernick."

Kid Rock doubled down on his criticism in a lengthy Facebook post:

"P.P.S. To be clear - Fuck ANYONE who takes a knee or sits during our national anthem! Pretty sure if Russell Wilson or Tom Brady were doing it they would have no problem finding a job playing for any team they wanted in the NFL! So cut the bullshit!"

The singer had previously shared the same sentiment about the quarterback during a live performance of the song a year ago in Boston.

Kid Rock was reportedly paid a record-setting $600,000 to perform a 100-minute set at the Iowa State Fair. The singer, who has zero political experience, posses a serious threat to the Michigan senate race as he is reportedly considered favorable by 36 percent of voters, trailing leading candidate Debbie Stabenow (39 percent) by just three percent, according to NBC News.

Kaepernick, 29, remains a free agent after spending his first six seasons with the 49ers. The former starter gained national attention last season for his decision to kneel during the national anthem as a form of protesting social injustice.

Several teams have passed on Kaepernick this offseason as many consider him to be a potential distraction given his constant media coverage. Still, there's little argument that the former 49ers starter — who led the team to a Super Bowl appearance in 2012 — isn't a better option than many of the backups signed this offseason.

Several other players have already echoed Kaepernick's protest early in preseason. Nearly a dozen players from the Cleveland Browns went to their knee during the national anthem, including tight end Seth DeValve, the first white player to kneel during the anthem since Kaepernick's initial protest.