Update: Trump's campaign will no longer use "Rockin' in the Free World", as Rolling Stone reports. "There are plenty of other songs to choose from, despite the fact that Mr. Trump is a big fan and likes Neil very much," said campaign manager Corey Lewandowski. "We will respect his wish and not use it because it's the right thing to do." On Facebook, Young also wrote about why he doesn't let politicians use his music; read it here, and find an excerpt below.

Today, Donald Trump announced that's he's running for President of the United States of America. Before he gave his speech, Neil Young's "Rockin' in the Free World" played. You know, the same Neil Young who wrote a song about George W. Bush called "Let's Impeach the President" and is about to release an album about Monsanto.

Obviously, Young is not OK with Trump using his music.

"Donald Trump was not authorized to use 'Rockin' in the Free World' in his presidential candidacy announcement," reads a statement from Young's representative. "Neil Young, a Canadian citizen, is a supporter of Bernie Sanders for President of the United States of America."

Trump's representatives told TMZ that they "paid for and obtained the legal right" to use the song.

As Young wrote on Facebook:

I do not trust self serving misinformation coming from corporations and their media trolls. I do not trust politicians who are taking millions from those corporations either. I trust people. So I make my music for people not for candidates.

The Monsanto Years is out on June 29 via Reprise. Here's his environmental anthem from Storytone, "Who's Gonna Stand Up":