In a stream of efforts, U.S. President George W. Bush on Thursday again voiced concern over the violent crackdown in Tibet by Chinese authorities. Bush's concerns came as yet another European leader on Thursday vowed to boycott the 2008 Beijing Olympics, which China says are being rattled by Tibet's religious leaders, the Dalai Lama. China has no relations with the Dalai Lama, who has been living in exile. A White House statement said Bush called Chinese President Hu Jintao to stress the need for talks between Beijing and the Dalai Lama. Bush called Jintao to raise “his concerns about the situation in Tibet and encouraged the Chinese government to engage in substantive dialogue with the Dalai Lama's representatives and to allow access for journalists and diplomats,” the statement said.