Originally Posted by sdsearch

You aren't likely to get denied. Your application may go on hold, though, pending them getting in touch with you, if they can't allocate enough CL to open the new card without moving it around.

Though if you have only 1 Citi card open, I would presume that's less likely, assuming you have a good and reasonably long credit history overall. But what's still possible is that they'll only be able to given a "token" CL on the new card (which might make $3k minimum spend harder to do), and may want to get in touch with you (or you may want to get in touch with them a couple days after you apply, if not approved yet by then) to ask if they can raise your CL on the new card by pulling some from the existing card (especially if your existing card has more than plenty).