A minimum of 45 senators must support the motion to remove DP from office.
On Monday, the Office of the Clerk of the National Assembly, submitted evidence to the Senate on Gachagua's impeachment.
The motion sponsored by Kibwezi West MP, Mwengi Mutuse provided 11 grounds for Gachagua's impeachment.
Gachagua's lead counsel is senior lawyer Paul Muite, assisted by a battery of lawyers, including Elisha Ongoya, Victor Swanya, Faith Waigwa, Ndegwa Njiru, Amos Kisilu and Tom Macharia.
The DP has worked round the clock to stop his impeachment, which has also seen 26 petitions filed in court but two have been withdrawn. Gachagua is accused of gross violation of several articles of the Constitution, with Mutuse stating he has significantly undermined national unity and the peaceful coexistence of Kenya's diverse communities.
This, the motion states, has been by persistently making inflammatory and inciteful utterances threatening to discriminate, exclude and unlawfully deny sections of the people of Kenya and regions of Kenya equal opportunities for public service appointments and allocation of public resources. According to the motion, the DP has made unilateral public statements inconsistent with policy positions collectively adopted by the Government and contradicted the President on critical matters of governance and the exercise of the President's function as a symbol of national unity.
"On various dates throughout the last two years, Gachagua undermined the President and Cabinet and the effective discharge of the National Government's executive mandate by making unilateral public statements that were in consistent with policy positions collectively adopted by the Government," Mutuse says in his motion.
The third charge is accusations of violating the Constitution by undermining devolution, by interfering with the running of Nairobi City County Government.
Here, the DP is accused of inciting citizens against lawful directives of the County Government on the planning and relocation of markets and publicly disparaging its leadership and decisions.
According to the motion, Gachagua is said to have committed gross economic crimes, namely, conflict of interest, abuse of office, and conspiracy to commit crimes by inexplicably amassing property estimated at Sh5.2 billion that is incompatible with his known legitimate income.