Obama, 58, a longtime Democrat, said his “deep disappointment” in his brother Barack’s administration has led him to recently switch allegiance to “the party of Lincoln.”
The last straw, he said, came earlier this month when FBI Director James Comey recommended not prosecuting Democratic presidential candidate Hillary Clinton over her use of a private e-mail servers while secretary of state.
“She should have known better as the custodian of classified information,” said Obama.
Obama plans to trek back to the US to vote for Trump in November. Obama used to live in Maryland, where he worked for many years as an accountant and is registered to vote there, public records show.
The president’s and Malik’s father, Barack Obama Sr., left Kenya in 1959 when Malik was a year old and his mother was pregnant with his sister Auma. Obama Sr. enrolled at the University of Hawaii, where he met and married the president’s mother, Stanley Ann Dunham. Malik Obama didn’t meet his younger half-brother until 1985. President Obama, 54, has seven half-siblings from both sides of his family.