Russian MP Sergey Mironov has demanded that State Duma deputy, Ilya Ponomaryov, who voted against Crimean annexation, quit his post as his behavior ‘damaged the reputation of the Fair Russia party’, RT reports.

Mironov addressed Ponomaryov in an open letter published on social networks, in which he quoted the MP’s own recent statement opposing Crimea’s accession to the Russian Federation and calling Russia’s support of the Crimean referendum decision “a hypocritical and lowly deed.”

Mironov went on to censure Ponomaryov’s attitude to the Fair Russia party as “immoral and ignoble” and called for him to give up his parliamentary mandate.

The MP replied that he would fight for his seat ‘to the end.’

Ilya Ponomaryov was the only Lower House member who voted against the package of bills that allowed the accession of Crimea.