This bill threatens the U.S.'s ability to provide protection to asylum-seekers. The bill:

• makes illegal presence in the United States a felony
• denies all nonimmigrants – from temporary workers to victims of domestic violence – their right to an impartial removal  hearing if charged with an immigration violation
• makes asylum seekers choose between voluntary departure or a BIA appeal 
•  imposes the unlawful presence bars against those who could adjust their status 
•  expands mandatory detention and long-term detention
• eliminates the right to judicial review unless a circuit court judge approves it

The text of H.R. 4437 is available here.

The United Nations High Commissioner for Refugees has issued comments on the legislation, detailing the negative impact on asylum-seekers in the United States.  The UNHCR's comments on H.R. 4437 can be found here.