Given this paragraph, what is an important function of the London Assembly?

The administration of London is formed of two tiers: a citywide, strategic tier and a local tier. Citywide administration is coordinated by the Greater London Authority (GLA), while local administration is carried out by 33 smaller authorities.[128] The GLA consists of two elected components: the mayor of London, who has executive powers, and the London Assembly, which scrutinises the mayor's decisions and can accept or reject the mayor's budget proposals each year.

A important function of the London Assembly is to scrutinise the mayor's decisions and accept or reject the mayor's budget proposals each year.