Czech President Václav Klaus has said the Lisbon Treaty will not enhance freedom and democracy and says he supports Declan Ganley and Libertas.
The President also denied he was breaching the protocol of a State visit by speaking out on the issue.
Green Party TD Ciarán Cuffe earlier urged the Government to express some concern about the views of the visiting Czech President.
Mr Cuffe described Mr Klaus as ultra-conservative and anti-European and someone who denies the existence of man-made climate change.
Mr Klaus is in Dublin on a three-day State visit.
The Czech Republic takes over the revolving EU presidency on 1 January.
Dealing with the fallout of Ireland's rejection of the Lisbon Treaty will be a priority for the presidency.
