This follows the resignation of Senator Ali following the disclosure of a video of him in compromising circumstances.
Mr. Sinanan, the Deputy PNM Leader and the party's Campaign Manager in last year's General Election, was sworn in on the advice of the Prime Minister after Mr. Ali's seat was declared vacant in the Senate.
Leader of Government Business in the Upper House, Franklin Khan, used the opportunity to thank Mr. Ali for all of his work in the Senate in the nine months he served.
"He debated in the budget debate and I think on two other pieces of legislation and as Leader of Government Business, I welcome his contribution. I just want to caution the society that we have a culture here where for a single transgression, we condemn you for life and Mr. Ali is still a very young man. He may have done something inappropriate but I think he will work through his challenges and we should, as all former colleagues in the Senate and I speak on behalf of the PNM, that we will give him all the support he needs to work through this challenge and hope for the best for him and his family."
Mr. Ali unsuccessfully contested the Barataria/San Juan seat for the PNM in last year's General Election and was later appointed a Government Senator on Wednesday September 23rd, 2015, at the start of the 11th Republican Parliament.
According to the Parliament website, his two contributions in the Upper House came during the debate on the Appropriation (Financial Year - 2016) Bill, 2015 and the Strategic Services Agency (Amendment) Bill, 2016.