On 21 November 2004, Ansip became Chairman of Estonian Reform Party because the party's founder and hitherto chairman, former Prime Minister Siim Kallas, had become EU Commissioner and Vice President and thus had to move to Brussels.
Pada 21 November 2004, Ansip menjadi Ketua Reformierakond karena pendiri partai itu dan kemudian menjadi ketuanya, bekas Perdana Menteri Siim Kallas, telah menjadi Komisioner di Uni Eropa dan Wakil Presiden sehingga ia harus pindah ke Brussel.