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Golden State Warriors coach Steve Kerr has long been an outspoken critic of President Donald Trump.

Now, the former Arizona Wildcats basketball star is throwing his support behind Joe Biden’s campaign in Arizona by assisting with a virtual phone bank in Tucson on Tuesday.

The campaign for the Democratic nominee for president announced Monday that Kerr, a former general manager for the Phoenix Suns and NBA player, will be encouraging Arizona voters to check their voter registration status Tuesday via a virtual phone bank to help people “make a plan to vote early for Joe Biden and Democrats up and down the ticket.”

The bank is scheduled to begin at 4 p.m. Arizona time.

Tuesday is National Voter Registration Day.

Arizona’s deadline for voter registration is Oct. 5.

Kerr was drafted by the Suns and played his rookie season in Phoenix. He was the team’s general manager from 2004-10.

He helped the University of Arizona reach the Final Four of the NCAA Tournament in 1988.

MORE: President Trump criticizes NBA, Steve Kerr, Spurs Coach Gregg Popovich; says league ‘pandering’ to China

Kerr, who has coached the Warriors since 2014, has clashed with Trump in the past.

In 2017, he questioned Trump’s credentials to be president in an interview with Sports Illustrated.

“Frankly, I think it’s why Trump couldn’t be more ill-suited to be president, because he’s a blowhard,” he said. “You don’t see some of the qualities you talk about, the resilience, the ability to communicate, the compassion. None of that. But in the old days, a lot of great coaches who maybe didn’t have those, there was still a fiber there, whatever it was. To be a great leader, there have to be some qualities in there.

“Has anyone ever thought that Donald Trump was a great leader?”

In October 2019, Trump slammed Kerr regarding Kerr’s answer to questions surrounding the NBA and China. 

“So funny to watch Steve Kerr grovel and pander when asked a simple question about China. He chocked (sic), and looks weak and pathetic. Don’t want him at the White House!” Trump wrote on Twitter. 

“I watched this guy Steve Kerr. He was like a little boy who was so scared to be answering the question,” Trump told reporters at the time. “He couldn’t answer the question. He was shaking like, ‘Oh, I don’t know.’ He didn’t know how to answer the question. Yet, he’ll talk about the United States very badly. I watched Popovich do sort of the same thing. But he didn’t look quite as scared, actually.”

Kerr responded that he was merely the latest “shiny object” for Trump, and that “This is just another day. I was the shiny object yesterday. There was another one today, there will be a new one tomorrow. And the circus will go on. It’s just strange, but it happened.”

USA TODAY Sports’ Jace Evans and Scott Gleeson contributed to this story.