(CNN) Democratic presidential candidate Sen. Kamala Harris has called on Twitter to suspend its most high-profile user: President Donald Trump.

In a letter to Twitter CEO Jack Dorsey dated Tuesday, Harris pointed to six tweets Trump has sent since last Friday that Harris says violated Twitter's rules.

Harris said that Trump has used his account to "target, harass, and attempt to out the whistleblower" whose allegations about Trump's call with the leader of Ukraine prompted Democrats to launch an impeachment inquiry.

"President Trump also published the following tweet suggesting that violence could be incited should Congress issue formal articles of impeachment against him," she wrote, highlighting a tweet Trump sent on Sunday that read: "....If the Democrats are successful in removing the President from office (which they will never be), it will cause a Civil War like fracture in this Nation from which our Country will never heal." The tweet was a selective quote of a supporter on Fox News.

Harris also pointed to tweets Trump sent that said Rep. Adam Schiff should be "questions at the highest level for Fraud & Treason."

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