Conversation so far:
What did he do in 2014?
On April 9, 2014, Mulvaney offered a proposal based on the Obama proposal as a substitute amendment in order to force a vote on the President's budget request.
Did the proposal pass?
request.
The President's proposal failed in a vote of 2-413, although Democrats were urged by their leadership to vote against this "political stunt..
What did he do then when the proposal didn't pass?
CANNOTANSWER.
Was there anything else interesting about the article?
The deal was designed to make up for this increase in spending by raising airline fees and changing the pension contribution requirements of new federal workers.

Question: What other changes did were made?
Self-contained rewrite: What other changes were made other than the pension contribution requirements?