Roh's successor, Lee Myung-bak, was inaugurated in February 2008. Stating "creative pragmatism" as a guiding principle, Lee's administration set out to revitalize the flagging economy, re-energize diplomatic ties, stabilize social welfare, and meet the challenges of globalization. In April 2008, the ruling party secured a majority in the National Assembly elections. Also that month, summit talks with the United States addressed the Korea-US Free Trade Agreement and helped ease tensions between the two countries caused by the previous administrations. Lee agreed to lift the ban on US beef imports, which caused massive protests and demonstrations in the months that followed, as paranoia of potential mad cow disease gripped the country.