The 52-year-old, who is the son of Meghan's father Thomas Sr., was driving by Oregon State Police, who stopped him and noted he was visibly intoxicated.
The troubled sibling of the royal was cuffed and taken into custody Friday at 1:33 a.m. after cops performed a field sobriety test and noted his impairment was obvious.
He was taken to the police sobering centre near his home and his Chevy Silverado was impounded.
Last year Markle Jr sent Prince Harry a letter before he married the former Suits actress, telling him: 'It's not too late.
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Trump has denied any collusion with Moscow and Russian Federation has said it did not meddle in the election . In his latest interview, the president's lawyer said it was time for the special counsel to issue his report.
Meghan Markle's half-brother Thomas has been arrested by police in the United States for drink driving. Markle Jr. was arrested in January 2017 after he pulled a gun on his fiancée, Darlene Blount, during a heated and drunken argument.
Meghan is not now in contact with her half-brother, father Thomas Markle Sr or half-sister Samantha Markle.
He hoped that despite an estranged relationship between Meghan and his side of the family that his nuptials would bring them closer.
Just before Christmas, Meghan's father Thomas Markle Sr, 74, told ITV's Good Morning Britain he had been texting her every day but she will not return any of his messages.
Their sister, Samantha, said: "His drinking is not related to Meghan".
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