Conversation so far:
What was his duties with the proposals?
promoting the Trump administration's budget proposal.
How did he do that?
Mulvaney stated that, as to taxpayers, the government was "not gonna ask you for your hard-earned money.
Was his proposal successful?
In December 2017, the President signed the Tax Cuts and Jobs Act of 2017.

Question: What did this do for the people?
Self-contained rewrite: What did signing Tax Cuts and Jobs Act of 2017 do for the people?