 Tantawi is a member of the 25-30 Alliance created for the 2015 Egyptian parliamentary election, whose name refers to the 2011 Egyptian revolution that started on 25 January 2011 and the 30 June 2013 protests that led to the overthrow of President Mohamed Morsi.He was successfully elected to the Egyptian House of Representatives in the 2015 election in the individual component of the second phase of the election, along with 13 others in the alliance.On 14 February 2019, Tantawi was one of the 16 members of parliament (MPs) who voted against the parliamentary motion for amending the Egyptian constitution, that led to the 2019 Egyptian constitutional referendum in April 2019.