what is bricker amendment?
It is the collective name of a number of slightly different proposed amendments.
Bricker Amendment
The Bricker Amendment is the collective name of a number of slightly different proposed amendments to the United States Constitution considered by the United States Senate in the 1950s. 
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Bricker Amendment [SEP] Introduction
The Bricker Amendment is the collective name of a number of slightly different proposed amendments to the United States Constitution considered by the United States Senate in the 1950s. None of these amendments ever passed Congress. Each of them would require explicit congressional approval, especially for executive agreements that did not require the Senate's two thirds approval for treaty. They are named for their sponsor, conservative Republican Senator John W. Bricker of Ohio, who distrusted the exclusive powers of the president to involve America beyond the wishes of Congress. American entry into World War II led to a new sense of internationalism, which seemed threatening to many conservatives.