Lech Kaczynski said he will only sign the EU's treaty if Ireland approves it in a new referendum.
He said if Ireland makes another decision, but not under pressure, and without changing its Constitution, then Poland will not place a block on the treaty.
He said he would not block the Treaty then, because the Polish parliament has already approved the treaty.
On Tuesday, the conservative president, who is considered a Eurosceptic, said ratifying the treaty after Ireland's rejection of it would be 'pointless'.
