Malaysian citizens wait in a line to cast their ballots during the voting day of general election in Kuala Lumpur, Malaysia, on May 9, 2018. (SADIQ ASYRAF / AP)

A woman on a wheelchair is assisted as she casts her vote for the general election, in Pekan, Pahang state, Malaysia, on May 9, 2018. (AARON FAVILA / AP)

A man folds his marked ballot paper at a voting center during the general election in Alor Setar, state capital of Kedah, northern Malaysia, on May 9, 2018. (ANDY WONG / AP)

Malaysian Prime Minister Najib Razak greets residents after voting at his hometown in Pekan, Pahang state, Malaysia on May 9, 2018. Malaysia's general election on May 9, 2018 will determine if scandal-plagued Prime Minister Najib's coalition can continue his rule which is under unprecedented challenge from former strongman Mahathir Mohamad. (AARON FAVILA / AP)

Malaysian Prime Minister Najib Razak shows his finger that is marked in ink after voting for the general election at his hometown in Pekan, Pahang state, Malaysia, on May 9, 2018. (AARON FAVILA / AP)

Former Malaysian strongman Mahathir Mohamad shows his finger that is marked in ink after voting for the general election in Alor Setar, state capital of Kedah, northern Malaysia, May 9, 2018. (ANDY WONG / AP)

Former Malaysian strongman Mahathir Mohamad (in the car) is mobbed by journalists as he prepares to leave after voting for the general election in Alor Setar, state capital of Kedah, northern Malaysia, May 9, 2018. (ANDY WONG / AP)