Cabinet minister Chirau Mwakwere took members of staff by surprise when he arrived in full official gear and went about his duties at the Transport ministry.
This was the first time the minister showed up at the ministry since the High Court in Mombasa nullified his election as Matuga MP.
Mwakwere summoned all departmental heads to a meeting, which he chaired, to discuss official matters.
"He arrived in the morning and went about carrying his duties. He even chaired a meeting, which was also attended by the PS Cyrus Njiru and Head of Administration Philomena Koech," said a source who could not be named.
The source added the top officials quickly consulted legal experts before agreeing to attend the meeting.
"We were taken by surprise by the arrival of the minister leave alone summoning us all to a meeting," said one of the officials who, however, declined to discuss details.
Another official said Mwakwere wanted an update of what had been going on in the ministry "while he was away".
"Technically, the minister has lost it unless he lodges an appeal against the High Court verdict, but legally, he remains a minister until the Speaker declares his seat vacant," said a top ministry official.
He added: "The President too cannot replace him before the Speaker declares the Matuga seat vacant".