I say, and with God's help: It is permissible for him to perform tayammum, and it is not obligatory for him to perform wudu initially. However, if he is in a state of major impurity (janabah) and there is an event that necessitates wudu, then he must perform both wudu and tayammum. Refer to: Sharh al-Wiqayah p. 105, Fath Bab al-'Inayah 1: 110, and al-Tabyin 1: 235, and God knows best.