In February 2013 Okamura was among a group of senators to sign a proposal to prosecute president Václav Klaus for high treason, regarding the amnesty announced by Klaus on finishing his term. The proposal was rejected by the Constitutional Court of the Czech Republic. Okamura also supported the constitutional amendment to abolish lifelong immunity for public officials. His Senatorial term expired on his election to the Chamber of Deputies, after he had served in the Senate for one year and six days.
