When an application is filed with the United States Customs and Immigration Services (USCIS)  whether it be for a family based green card or an employment based visa such as H1-B it is possible that the government will issue you a notice of an intent to deny. Generally, this means that there is lack of sufficient documentation for the application.  There  is also normally a deadline in which you must respond. Failure to respond in a timely fashion will almost certainly lead to a denial. If you receive a Notice of Intent to Deny it is best to hire an immigration attorney to assist you. It is not only important to respond in a timely fashion, it is also essential to supply sufficient evidence to overcome the reasons for the possible denial. For example, if a US citizen files an I129 fiancee petition, but does not submit enough evidence to establish the two people know each other and are  in a relationship, a Notice of Intent to Deny may be issued.  Evidence of the relationship could include records of trips taken together, email correspondence and photos of the couple.