Ian is correct. He was denied a visitor a visa on the UK before. I am not trying to not meet, lol. We have twice (: and our k-1 is already approved by USCIS. Thanks for all the help!
It's mentioned in the Foreign Affairs Manual, 9 FAM 40.41 N4.6-3:
http://www.state.gov/documents/organization/86988.pdf
Because INA 212(a)(4)(C ) and INA 213A require the use of Form I-864, Affidavit of Support Under Section 213A of the Act, for so many classes of immigrants, the use of Form I-134, Affidavit of Support, has been reduced considerably. Nevertheless, there still are circumstances when Form I-134 will be beneficial.
This affidavit, submitted by the applicant at your request, is not legally binding on the sponsor and should not be accorded the same weight as Form I-864.
Form I-134 should be given consideration as one form of evidence, however, in conjunction with the other forms of evidence mentioned below.
The US government tried to enforce the I-134 numerous times in court and failed. The contract portion of the form was badly written. Congress passed a law in 1996 that required an enforceable affidavit of support for immigration, and added section 213A to the INA. In response, INS produced the I-864. Consulates still use the I-134 for non-immigrant visas.