In continental policy, Tusk strongly supported greater political and economic integration within the European Union, strongly backing the implementation of the Lisbon Treaty, standing in stark contrast to President Lech Kaczyński's vehement opposition. Tusk repeatedly stated his government's intention in bringing Poland into the Eurozone. Originally wanting to introduce the euro by 2012, Tusk envisaged in 2009 a starting year of 2015 as "a realistic and not overly-ambitious goal". However, during the European sovereign debt crisis, Tusk and his government displayed less optimism in joining the monetary union under contemporary economic circumstances, leading to Finance Minister Jan Vincent-Rostowski calling any move "unthinkable". Despite not being a member of the eurozone, Tusk pressed that Poland, along with the other non-eurozone states of the EU, should be included in future euro financial negotiations.