Is it permissible for the imam to say to the worshippers: Wait until I perform wudu?
Machine translationRead the Arabic original
Question : Yes.
Answer : It is permissible for them to stand, and if no one takes his place, he may say to them, “Wait, I will perform wudu,” and there is no harm in that. This is because the Messenger (peace and blessings be upon him) had the iqamah called for the prayer one day, and when he was about to say the takbir, he told them to wait. They remained standing until he went, broke his wudu, and returned to pray.
Answer : It is permissible for them to stand, and if no one takes his place, he may say to them, “Wait, I will perform wudu,” and there is no harm in that. This is because the Messenger (peace and blessings be upon him) had the iqamah called for the prayer one day, and when he was about to say the takbir, he told them to wait. They remained standing until he went, broke his wudu, and returned to pray.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 219- هل يجوز للإمام أن يقول للمصلين: انتظروا حتى أتوضأ؟ II ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.