 Jasiński served as Minister of State Treasury in the Cabinet of Kazimierz Marcinkiewicz and the Cabinet of Jarosław Kaczyński.From 2001 to 2015 (4th, 5th, 6th, 7th and 8th term), Jasiński was a member of the Sejm.During his parliamentary tenure, he held several key roles, including Chairman of the Economy Committee, Chairman of the Public Finance Committee, and Chairman of Standing Subcommittee for the Banking System and Monetary Policy.