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CHARLESTON, SC - FEBRUARY 18: Republican presidential candidate Donald Trump talks talks on the phone while making a stop for lunch between campaign events at Fratello's Italian Tavern in North Charleston, SC on Thursday Feb. 18, 2016. (Photo by Jabin Botsford/The Washington Post via Getty Images)
CHARLESTON, SC - FEBRUARY 18: Republican presidential candidate Donald Trump talks talks on the phone while making a stop for lunch between campaign events at Fratello's Italian Tavern in North Charleston, SC on Thursday Feb. 18, 2016. (Photo by Jabin Botsford/The Washington Post via Getty Images)

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    Security concerns over Trump's phone use

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Security concerns over Trump's phone use

President Trump exchanged personal cell phone numbers with other world leaders, causing new security concerns over the use of his cell phone. CNN's Brian Todd reports.

Security concerns over Trump's phone use

President Trump exchanged personal cell phone numbers with other world leaders, causing new security concerns over the use of his cell phone. CNN's Brian Todd reports.