(Updated Below)

I’ve scanned the amendments submitted thus far to the Senate immigration bill (S.744) and found at least four five that pertain to English proficiency:

S.A. 1204, introduced by Sen. Inhofe (R-OK)
AKA the “English Language Unity Act of 2013’’. Would declare English the official language of the United States government.

S.A. 1205, introduced by Sen. Inhofe (R-OK)
Would amend the Civil Rights Act of 1964 so that it would be legal for an employer to “require employees to speak English while engaged in work.”

S.A. 1206, introduced by Sen. Inhofe (R-OK)
Would require each government agency, within 180 days of enactment, to provide a “Multilingual Services Expenses Report” that provides a summary and analysis of all multilingual services provided.

S.A. 1225, introduced by Sen. Rubio (R-FL)
Would remove the opportunity for immigrants applying for legal residency status to demonstrate that they are “satisfactorily pursuing a course of study, pursuant to standards established by the Secretary of Education, in consultation with the Secretary, to achieve an understanding of English and knowledge and understanding of the history and Government of the United States” at the level of proficiency now required for citizenship. Instead it would require that all immigrant achieve that level of proficiency prior to applying for a green card.

S.A. 1348, introduced by Sen. Fischer (R-NE)
Would insert an English language requirement as a prerequisite to registered provisional immigrant status. Essnetially, an undocumented immigrant who could not demonstrate English proficiency would not be allowed to attain legal status of any kind at all. h/t CLASP

Let me know if I missed anything!

UDPATE 6/20/13: I’m updating as I go. Just added the Fischer amendment (see above).