In foreign affairs, Nixon, the anti-Communist crusader, opened relations with Communist China and achieved détente with the Soviet Union signing an agreement to limit nuclear arms. Nixon was re-elected in 1972 by an overwhelming margin. But as an aide would later say, a cancer was growing on the presidency. During the campaign, members of Nixon's reelection team burglarized Democratic headquarters at the Watergate complex in Washington. Top government officials were implicated, but Nixon denied any knowledge.