At an enlarged Politburo meeting in Shanghai, held from March 25 – April 1, Peng openly criticized Mao in the Chairman's presence for the first time, accusing him of "taking personal command" of national politics and disregarding the collective leadership of the Chinese government and the Party. Mao responded with vague criticisms of Peng, which Peng said was "provocative". From April 24 – June 15 Peng left on a goodwill military tour through Eastern Europe. Peng met with Khrushchev on May 24, and was criticized during the Cultural Revolution for having criticized Mao's leadership to the Soviet leader, but the evidence that Peng criticized Mao to Khrushchev is very circumstantial, and Mao did not mention this during his efforts to have Peng purged. Peng's absence from China during the seven weeks that he was abroad allowed Mao to freely spread negative rumors discrediting Peng within the Party, and to develop consensus among other senior Party leaders to oppose Peng when he returned.