CNN reported that the man claimed he had a bomb in his vehicle.
Officials stopped Keoughan's auto Saturday night, about a quarter-mile from President Trump's executive residence.
Police say the man was driving a 2017 Chevrolet Impala that was reported stolen from Roanoke, Virginia.
The arrest came about a week after a more serious incident that called into question security outside the White House.
The incident occurred at 11:05 p.m.at a security checkpoint, the Secret Service said.
The spokesperson said no other information would be provided until the ongoing investigation is concluded.
One person is in custody after a vehicle drove up to a White House checkpoint on Saturday night, the US Secret Service has said.
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On Friday, it was revealed that the intruder was on White House property for more than 16 minutes, much longer than originally thought.
"The individual was immediately apprehended by United States Secret Service Uniformed Division Officers before reaching the White House fence", the statement said, adding that criminal charges are pending.
The security posture at the White House has returned to normal, the sources said. When Keoughan was taken to the ground by police, he said "this is a test".
Four hours after the claim was made, the checkpoint remained blocked, but several streets in the area, which had been closed, re-opened.
Two Secret Service agents tackled him to the ground and he was removed.
President Donald Trump was not at the residence, having traveled to his Mar-a-Lago resort in Palm Beach, Florida, for the weekend. He also said he could communicate telepathically with the President.
President Trump was note home at the time of the incident.