On May 9 2011 she became a Member of the European Parliament replacing Zoran Thaler who resigned from the position due to accusations regarding corruption.

[1] She is a member of Social Democrats, center-left wing political party in Slovenia.

After her studies Kleva was following the EU accession process of Estonia and Lithuania at the European Parliament in Brussels.

In 2009 she became a permanent representative of the National Assembly of the Republic of Slovenia to the European Parliament in Brussels.

In May 2011 Mojca Kleva replaced Zoran Thaler as a member of the European Parliament within S&D (Group of the Progressive Alliance of Socialists and Democrats).