
Temer, the predecessor of current President Jair Bolsonaro, was Brazil’s most unpopular leader ever and faced a number of corruption accusations on leaving office last year.
Police arrested Temer in Sao Paulo on the order of a federal criminal judge, reports said. Former mines and energy minister Moreira Franco was also detained.
The so-called Car Wash investigation uncovered a vast graft operation involving Petrobras and major construction companies and bribes to politicians of several parties.
Temer, a centre-right politician, took over as a caretaker figure after the last Workers Party president, Dilma Rousseff, was impeached and removed from office in 2016.