。
At this stage I can't comment on that issue.
Literal
Present stage [at-では] that problem [about-について] cannot-comment-[polite-できません].
Standard non-answer from a press conference or official statement. 現段階 ('present stage') is a formal phrase for 'at this point in time.' ~について ('about, regarding') is the topic marker. コメントできません combines loanword コメント + できる 'can' negative. A model of a polite deflection.