Actor Rob Lowe deleted a tweet mocking Sen. Elizabeth WarrenElizabeth Ann WarrenOvernight Health Care — Presented by Partnership for America's Health Care Future — ObamaCare premiums dropping for 2020 | Warren, Buttigieg shift stances on 'Medicare for All' | Drug companies spend big on lobbying Mellman: Trumping peace and prosperity On The Money: Waters clashes with Trump officials over 'disastrous' housing finance plan | Dems jump into Trump turf war over student loans | House passes bill targeting anonymous shell companies MORE (D-Mass.) over her past claims of Native American ancestry.

“I deleted my Elizabeth Warren tweet,” Lowe tweeted late Saturday night. “It was a joke and some peeps got upset, and that’s never my intention.”

“On the GOOD side: I just got to use the Oxford comma!” he added.

Lowe’s tweet did not use an Oxford comma, which appears in a list of three or more items separated by commas.

Earlier Saturday, the “West Wing” actor wrote in the now-deleted tweet that Warren running for president “would bring a whole new meaning to Commander in 'Chief.’”

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Warren, who officially launched her 2020 campaign on Saturday, has come under fire for identifying herself as Native American in the past. Last week she apologized and clarified that she understands the difference between tribal citizenship and a DNA test indicating Native American ancestry.

President TrumpDonald John TrumpGraham to introduce resolution condemning House impeachment inquiry Support for impeachment inches up in poll Fox News's Bret Baier calls Trump's attacks on media 'a problem' MORE, who has repeatedly mocked Warren over her claims, called out the Democrat again in a tweet Saturday, and appeared to reference the Trail of Tears forced relocation of thousands of Native Americans.

"Today Elizabeth Warren, sometimes referred to by me as Pocahontas, joined the race for President,” he wrote. “Will she run as our first Native American presidential candidate, or has she decided that after 32 years, this is not playing so well anymore? See you on the campaign TRAIL, Liz!”

--This report was updated at 10:29 a.m.