The right-wing Democrats for a Strong Bulgaria (DSB), whose leader Ivan Kostov served as prime minister from 1997 to 2001, has insisted on Filchev's arrest and thorough investigation.
Desničarska stranka, Demokrati za jaku Bugarsku (DSB), čiji je čelnik Ivan Kostov bio premijer od 1997. do 2001, ustrajavala je na uhićenju Filcheva i detaljnoj istrazi.