The literacy test alone was not enough to prevent most potential immigrants from entering, so members of Congress sought a new way to restrict immigration in the 1920s. Immigration expert and Republican Senator from Vermont William P. Dillingham introduced a measure to create immigration quotas, which he set at three percent of the total population of the foreign-born of each nationality in the United States as recorded in the 1910 census. This put the total number of visas available each year to new immigrants at 350,000. It did not, however, establish quotas of any kind for residents of the Western Hemisphere. President Wilson opposed the restrictive act, preferring a more liberal immigration policy, so he used the pocket veto to prevent its passage. In early 1921, the newly inaugurated President Warren Harding called Congress back to a special session to pass the law. In 1922, the act was renewed for another two years.