 Imbert was also appointed as the Leader of Government Business in the House of Representatives of Trinidad and Tobago from November 2007 to May 2010

In the 2010 general election, after the then Prime Minister Patrick Manning called a snap election, Imbert won his seat, Diego Martin North/East, for the seventh time.However, the PNM lost the overall election, winning only 12 out of 41 seats in the House of Representatives, and he became a member of the Parliamentary Opposition for the second time in his political career.In the 2015 general election held on 7 September, Imbert once again won the seat of Diego Martin North/East with the largest ever vote count in his political career.