Neil Young criticized Donald Trump in an open letter to the US president, telling him, 'you are a disgrace to my country,' after the Canadian-born rock legend recently became a US citizen and indicated he would vote as a Democrat.

Young, 74, who published the letter Tuesday, added that Trump's 'bragging about the US economy does not disguise the fact' that he's boasting about figures he 'inherited 4 years ago', in a reference to his predecessor, Barack Obama.'

'Our first black president was a better man than you are,' the climate change activist adds about Obama, as he continued to rip into Trump, attacking his policies for worsening the 'Climate Crisis'.

Neil Young lashed out at Donald Trump in an open letter to the US president, telling him, 'You are a disgrace to my country,' after the Canadian-born rock legend recently became a US citizen and indicated he would vote as a Democrat

A tweeted image of Young after the Canadian-born rock legend became a US citizen last month shows he was throwing his support to the Democratic party

In his open letter, Young says Trump's 'bragging about the US economy does not disguise the fact' that he's boasting about figures he 'inherited 4 years ago', in a reference to his predecessor, Barack Obama

He tells Trump, 'The United States of America, my country, is not a green on one of your branded golf courses that you can ride around on and damage so that other players cannot shoot straight'.

The singer references his 1989 song 'Rockin' in the Free World', warning Trump to think of him every time the tune is played at one of the president's rallies.

'Remember, it is the voice of a tax-paying US citizen who does not support you. Me,' Young writes.

The open letter comes after Young celebrated becoming a US citizen in a tweet last month, which includes footage of him saying he was proud to be a 'Canamerican'.

Despite delays in his citizenship application after he admitted to marijuana use, Young swore his oath to the US and became a citizen, waving an American flag in victory at the Convention Center in downtown LA on Jan. 26.

The songwriter gripped his citizenship paperwork as he exited the building on an escalator with his wife, actress Daryl Hannah, wearing a big grin.

After 50 years living in California and paying taxes, it took his Malibu home burning during the Woolsey wildfire of 2018 to urge him to finally become a dual citizen.

'I'm happy to report I'm in!!' he wrote on his website after the ceremony, while encouraging fans to 'vote their conscience'.

Neil told the Los Angeles Times he plans to remain a Canadian citizen but the loss of his home motivated him to take action.

'I live down here; I pay taxes down here; my beautiful family is all down here — they're all Americans, so I want to register my opinion,' he told the LA Times.

'We've got a climate emergency, and governments are not acting'.

Young's music has long touched upon his social and political passions.

Daryl Hannah and Neil Young attend the 'Paradox' premiere at the Paramount Theatre in Austin, Texas, in March 2018.

His songs include, 'Ohio,' which recalls when National Guardsmen killed four students at Kent State University during Vietnam War protests in 1970.

'Rockin' in the Free World,' is a commentary on the 1980s and a critique of the inequalities in American society under Republican President Ronald Reagan's policies.

His open letter to Trump says Young doesn't blame people who voted for him.

'I support their right to express themselves, although they have been lied to, and in many cases believed in the lies, they are true Americans. I have their back'.

Young, a two-time Rock and Roll Hall of Fame inductee, has long touched upon his social and political concerns in his music

Young also hints that he is throwing his support behind Democratic presidential candidate Bernie Sanders.

'One of your opponents has the answers I like,' Young writes.

'He is aiming at preserving our children's future directly. He is not popular with the democratic establishment because unlike all the other candidates, he is not pandering to the industries accelerating Earth's Climate Disaster, the end of the world as we know it,' the rock entertainer explains.

'He is truly fighting for the USA. His initials are BS. Not his policies.'

Young concludes with one final warning to Trump: 'We are going to vote you out and Make America Great Again,' and links to a video of him and the band Promise of the Real, performing the politically charged song from 2017, 'Children of Destiny'.