Pending I-I29F Fiance Application. Visits from Cananda to the USA

[Shossack]

My Fiancé resides in Canada I live in the states. Just over a month ago we submitted out documents and have a pending I-I29F Petition for alien fiancé. My question is while this application is pending (which to my understanding can take up to 8 months with the USCIS office in California) can he enter into the USA to visit me? I have been told no, that he can be denied entry at customs. Once this application gets approved we then have 90 days to get married and he can only enter the USA once during that 90 day time frame? The thought of going 8 potential months not seeing one another seems tough! I understand that I can enter into Canada to visit him but unfortunately my work in not as flexible as his. If he is denied entry at customs for the states are there any ramifications? Meaning, could it hold up, red flag our overall process?

If anyone has ANY answers to my many questions... I would greatly appreciate any advice!

Thank you

[BruceZaida]

Similar question

My Fiancee will be entering the USA on a tourist VISA and I will turn in the paperwork for a Fiancee VISA after she arrives. This makes it sound like she will not be able to gain entry again after we turn in the paperwork. Is this true? Budget cuts to all departments in the US government may turn a 7-9 month waiting period to 18 months because of downsizing of personel handling VISA's. This obviously is a problem if we cannot see each other!