Tokyo Metropolitan Government
Refers specifically to the administrative body governing Tokyo Metropolis (東京都).
The Tokyo Metropolitan Government plays an important role in supporting the lives of Tokyo residents.
都政 is a broader term for any metropolitan government, while 東京都政 specifies Tokyo.
東京都 is the geographical/political entity of Tokyo Metropolis; 東京都政 is its government.
Compound of 東京 (Tokyo) + 都政 (metropolitan government).