He never wore an Afro or a black beret but one scholar says Donald Trump
He never wore an Afro or a black beret but one scholar says Donald Trump's presidential campaign has been shaped by the Black Panther Party in some surprising areas.
PHOTO: DON EMMERT/AFP/AFP/Getty Images
Now playing
02:46
Trump threatens to sue Cruz as ad wars heat up
Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
PHOTO: Win McNamee/Getty Images
Now playing
01:44
Jill Stein raises millions for recount
Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
PHOTO: BRENDAN SMIALOWSKI/AFP/Getty Images
Now playing
02:14
Scientists urge Clinton to call for recount
LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
PHOTO: Matt Mills McKnight/Getty Images North America/Getty Images
Now playing
03:25
Donald Trump's wild ride
Now playing
01:46
Trump's challenges in the Middle East
donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg
donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg
Now playing
02:47
Fact checking Trump on crimes by immigrants
PHOTO: Mark Makela/Getty Images/Lintao Zhang/Getty Images
Now playing
01:26
Trump vs. the tape on Obama and the protester
Now playing
01:28
Trump compares Clinton email probe to Watergate
Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
PHOTO: John Locher/AP
Now playing
01:20
Donald Trump rushed off stage by Secret Service
PHOTO: AFP/Getty Images
Now playing
02:16
Trump reads letter from Patriot's coach at rally
US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.
US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.
PHOTO: Mandel Ngan/AFP/Getty Images
Now playing
01:56
Trump on US officials: 'What a group of losers'
donald trump nice and cool pensacola fl bts_00001523.jpg
donald trump nice and cool pensacola fl bts_00001523.jpg
Now playing
00:49
Trump's mantra in campaign's final week: Stay on point
donald trump nice to hillary clinton and democrats orig cm_00000000.jpg
donald trump nice to hillary clinton and democrats orig cm_00000000.jpg
Now playing
01:52
Audio of Trump praising the Clintons and Democrats
cuomo lewandowski hillary clinton email exchange newday_00002327.jpg
cuomo lewandowski hillary clinton email exchange newday_00002327.jpg
Now playing
01:28
Cuomo grills Lewandowski on Clinton email 'hypocrisy'
Now playing
00:10
This video is no longer available
Now playing
01:49
Meet the other Hillary Clinton and Donald Trump

Story highlights

Donald Trump on Friday threatened to sue Ted Cruz for "not being a natural born citizen" if the Texas senator 'doesn't clean up his act'

'If @TedCruz doesn't clean up his act, stop cheating, & doing negative ads, I have standing to sue him for not being a natural born citizen,' he tweeted

(CNN) —  

Donald Trump on Friday threatened to sue Ted Cruz for “not being a natural born citizen” if the Texas senator “doesn’t clean up his act” and stop running negative ads against him.

“If @TedCruz doesn’t clean up his act, stop cheating, & doing negative ads, I have standing to sue him for not being a natural born citizen,” he tweeted.

Trump has previously argued that if Cruz won the Republican nomination, Democrats would argue that the Canada-born Texas senator was ineligible for the presidency. Last month, Trump asked a rally if he should sue Cruz “just for fun” over the issue.

Earlier Friday, Trump questioned the sincerity of Cruz’s faith, accusing his opponent of being “so dishonest.”

“How can Ted Cruz be an Evangelical Christian when he lies so much and is so dishonest?” the Republican front-runner tweeted.

Trump also had called Cruz’s honesty into question in a tweet Thursday night.

“Lying Cruz put out a statement, ‘Trump & Rubio are w/Obama on gay marriage.’ Cruz is the worst liar, crazy or very dishonest. Perhaps all 3?” Trump said.

“There is more than a little irony in Donald accusing anyone of being nasty given the amazing torrent of insults and obscenities and vulgarities that come out of his mouth,” Cruz told reporters in Greenville, South Carolina. “Being attacked by Donald, it is always colorful. I will give him this: he’s not boring.”

Cruz communication director Rick Tyler said Trump was having a “Trumpertantrum,” a line the Texas senator has used in recent weeks.

“He needs to go to the time-out chair and think about his choices. That’s what you would do with any 3-year old having a Trumpertantrum,” Tyler said.

Trump and Cruz are in a tight race in South Carolina heading into the state’s primary later this month. Evangelicals are a key voting bloc in the Bible Belt state and Trump is leading with white evangelicals in the state, according to an NBC/WSJ/Marist poll last month.

But to keep Cruz, a Southern Baptist, from faring well, Trump has increasingly portrayed Cruz as fundamentally dishonest.

Trump previously slammed his chief presidential rival as a “total liar” as Cruz and his allies have claimed that Trump favors government-run, universal health care.

“Look, Ted Cruz is a total liar. I am so against Obamacare. I’ve been saying it for two years in my speeches, I’m going to repeal and replace Obamacare,” Trump said earlier this month on ABC’s “This Week.” “I don’t even know where he gets this.”

CNN’s Dana Bash and Theodore Schleifer contributed to this report.