Musician Willie Nelson said Tuesday that he's not bothered by the fact that many of his fans are boycotting him because he's headlining a rally for Rep. Beto O'RourkeBeto O'RourkeTrump slams 'very dumb' O'Rourke for proposals on guns, tax exempt status for churches Hillicon Valley: FCC approves T-Mobile-Sprint merger | Dems wrangle over breaking up Big Tech at debate | Critics pounce as Facebook's Libra stumbles | Zuckerberg to be interviewed by Fox News | Twitter details rules for political figures' tweets O'Rourke rips Bill O'Reilly: The problem with our economy is 'a disgraced TV host like you makes millions' MORE (D-Texas) later this month. 

"I don’t care," Nelson said on ABC's "The View. "You know, they’re entitled to their opinions and I’m entitled to mine." 

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Nelson added the he's been supporting Democratic lawmakers his entire life and that he didn't know why this latest event sparked outrage from a contingent of his fans. 

"Everybody has an opinion," he said. "Everybody has a right to an opinion." 

O'Rourke, who is running to unseat Sen. Ted CruzRafael (Ted) Edward CruzTrump slams 'very dumb' O'Rourke for proposals on guns, tax exempt status for churches Trump confirms Rick Perry to step down as Energy secretary Overnight Energy: Perry to step down as Energy secretary | Future of big-game hunting council up in the air | Dems lose vote against EPA power plant rule MORE (R-Texas) this November, announced last week that Nelson would headline a rally in Austin, Texas on Sept. 29. 

Rolling Stone reported that the appearance from Nelson would mark his first-ever public performance on behalf of a political candidate. 

Fans quickly took issue with the announcement, with many posting angry comments on the singer's Facebook page, where he had shared a post on his plans to headline an event for the Democratic Senate candidate. 

“Open your eyes Willie!” one user said on his Facebook. “Beto is a Socialist who probably has lied to you. This is a real shame you support him.”

“I am no longer willing to watch that hippie guitarist who supports that … socialist running for Senate,” another user said on Twitter.

Nelson in a statement said he and his wife "share [O'Rourke's] concern for the direction things are headed" in the U.S. 

While Texas has not elected a Democrat to the Senate in three decades, polls have continued to show that Cruz and O'Rourke are in a tight race. 

An average of polling produced by RealClearPolitics shows Cruz up by 4 points. The Cook Political Report rates the race as “Lean Republican.”