His political career began in 1998 when, running on the platform of the now defunct
United Nigeria Congress Party (UNCP), he contested and won a
Senate seat representing the Kebbi Central
constituency. The results of the election annulled soon after they were announced. Following the death of
military dictator General
Sani Abacha and a brief period of transition, new elections were held. Aliero, now representing the
All People's Party (APP), contested and won the Kebbi State gubernatorial election. He was sworn in on 29 May 1999. Aliero was re-elected in 2003 for a second four-year term and was one of only four incumbent ANPP (the APP was later renamed All Nigeria People's Party due to a factional split) governors to maintain their positions. Aliero left the ANPP and joined the Peoples Democratic Party (PDP) in February 2007. He contested the April 2007 general elections for the Senate and won under the banner of the PDP. He is currently the member representing Kebbi Central Senatorial District in the Senate of the Federal Republic of Nigeria. He has been switching from one party to the other. For example, he re-decamped to PDP after spending about a year in CPC in early 2012. He later moved from PDP to APC in 2014. He and his some of his close associates since 1999, like Sani Zauro, who was also former state chairman of defunct Congress for Progressive Change (CPC) board of trustees (BoT) in Kebbi State also quit PDP for APC. He was named the chairman, Senate committee on land transport of the 10th senate on 8 August 2023. == Corruption Allegations and Misconduct ==