U.S. Vice President Dick Cheney, starting a visit on Saturday to try to push forward Israeli-Palestinian peace talks, said Washington would never pressure Israel to take steps that threatened its security.Palestinians accuse Israel of undermining the U.S.-sponsored peace talks by expanding Jewish settlements, refusing to remove West Bank roadblocks and mounting offensives against militants in the Hamas-controlled Gaza Strip who fire cross-border rockets into the Jewish state. "America's commitment to Israel's security is enduring and unshakable, as is Israel's right to protect itself always against terrorism, rocket attacks and other attacks from forces dedicated to Israel's destruction," Cheney told a joint news conference with Israeli Prime Minister Ehud Olmert.