Nixon would embark on a second trip to the Soviet Union in 1974, meeting with Brezhnev in Yalta. They discussed a proposed mutual defense pact and other issues, but there were no significant breakthroughs in the negotiations. During Nixon's final year in office, Congress undercut Nixon's détente policies by passing the Jackson–Vanik amendment. Senator Henry M. Jackson, an opponent of détente, introduced the Jackson–Vanik amendment in response to a Soviet tax that curbed the flow of Jewish emigrants, many of whom sought to immigrate to Israel. Angered by the amendment, the Soviets canceled the 1972 trade agreement and reduced the number of Jews who were permitted to emigrate. Though détente was unpopular with many on the left due to humanitarian concerns, and with many on the right due to concerns about being overly accommodating to the Soviets, Nixon's policies helped significantly lower Cold War tensions even after he left office.
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