NBA legend Kareem Abdul-Jabbar is urging Americans not to vote for Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE, saying the GOP front-runner can't follow through on his promises.

“Trump’s dominance reflects your disgust and dissatisfaction, not an endorsement of his vague policies,” Abdul-Jabbar wrote in a Washington Post op-ed addressing Trump’s supporters.

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“Because Trump would be powerless to do a lot of the things that you want – make new laws, alter U.S. strategy – a vote for him is a guarantee that actual, realistic changes you want will never happen.

Abdul-Jabbar urged voters to find another way to bring about change.

“Instead of translating your outraged voices into meaningful action, you would be thwarted by a candidate who knowingly made promises he couldn’t keep,” the retired basketball star said.

“America works best when all voices are championed by true believers. Don’t let yours get lip-synced by the Milli Vanilli of politics.”

Abdul-Jabbar said Trump’s lack of political experience is a bigger liability than people realize.

“Even if Trump could win in November, bluster and insults are not enough when it comes to our economic, spiritual and social futures,” he said.

“Running a real estate company has nothing to do with running a country, forging alliances in Congress or dealing with foreign allies and enemies. Running a lemonade stand is not the same as running a massive citrus farm.”

The former professional athlete also accused Trump of being a false conservative.

“His windshield-wiper party affiliation – in 1999 he switched from Republican to independent, then to Democrat in 2001, then to Republican in 2009 – suggests either internal conflict on the issues or blatant pandering,” Abdul-Jabbar said.

“No wonder National Review, the house organ of the right, recently used an entire issue to showcase famous conservatives from across the spectrum warning against supporting Trump,” he added, citing the publication’s anti-Trump edition last month.

“To hear their critiques and pretend your candidate still advances your worldview is like being diagnosed with a deadly disease and refusing to listen to the doctors who are specialists in the field because you’re just going to walk it off.”

Abdul-Jabbar’s op-ed comes as Trump’s campaign faces its first test from voters in Iowa's caucuses Monday evening.

Abdul-Jabbar, a Muslim, has repeatedly criticized Trump after he called for temporarily banning all people of that faith from entering the U.S.