In fact, if an "at will" employment relationship (and most are) an employer can hire/fire as it deems fit. Employers have a great deal of discretion when it comes to setting the terms and conditions of employment. This would include not hiring someone based on their past financial situation (e.g. a foreclosure). In fact an employer can refuse employment to someone for any reason or no reason at all. Absent some form of actionable discrimination (and none is indicated in this case), your prospective employer's action was lawful; no laws have been violated.